[#220] Add deployment guide for Heroku (#651)

* [#220] Create deployments section with empty Heroku article.

* [#220] Add 'Setup Heroku tools' section

* [#220] Update 'Setup the Heroku tools' section

* [#220] Add 'Get the Bolt Slack app' section

* [#220] Outline prepare, deploy, and next steps.

* [#220] Update side bar to be 'Deploying'

* [#220] Move getting and preparing an app to the top sections.

* [#220] Update introduction

* [#220] Update 'Get a Bolt Slack app' section

* [#220] Update 'Preparing app for Heroku'

* [#220] Update the deploy sections

* [#220] Update all sections leading up to 'Deploy'

* [#220] Add the Deploy and Next Steps sections.

* [#220] Add environment variable section.

* [#220] Add images for updating the Slack settings.

* [#220] Update GitHub URLs and minor edits.

* [#220] Link to Getting Started with Heroku app

* [#220] Fix link to Getting Started guide

* [#220] Update Japanese side bar to be consistent with English

* [#220] Update /deployments to /deploying for consistency

* [#220] Update copy after running through guide end-to-end

* [#220] Update section and path from 'deploying' to 'deployments'

- See #651 (comment)
- See #651 (comment)

* [#220] Make Deployments section conditional on having content in lang

This will hide the section for Japanese documentation until there is
a translation available.

- See #651 (comment)

* [#220] Update intro for getting a Bolt app.

- See #651 (comment)

* [#220] Update explaining how to clone and change into the Bolt app.

- See #651 (comment)

* [#220] Remove unnecessary hint about using an existing app.

- See #651 (comment)

* [#220] Update with feedback from @shaydewael

- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)

* [#220] Update based on feedback from @misscoded

- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)
- See #651 (comment)

* [#220] Bundle getting-started-with-heroku example app

* [#220] Update description of example app

* [#220] Update references to slackapi/bolt-js-getting-started-app

* [#220] Fix typos and minor updates.

* [#220] Resolve merge conflicts with sidebar.html

docs/_config.yml

@@ -2,8 +2,8 @@
 # 'bundle exec jekyll serve'. If you change this file, please restart the server process.
 title: Bolt
 description: >-
-  A framework that makes Slack app development fast and straight-forward. 
-  With a single interface for Slack’s Web API, Events API, and interactive features, 
+  A framework that makes Slack app development fast and straight-forward.
+  With a single interface for Slack’s Web API, Events API, and interactive features,
   Bolt gives you the full power of the Slack platform out of the box.
 baseurl: /bolt-js
 url: https://slack.dev
@@ -15,6 +15,8 @@ collections:
     output: false
   steps:
     output: false
+  deployments:
+    output: true
   tutorials:
     output: true
     permalink: /tutorials/:slug
@@ -34,13 +36,16 @@ t:
     advanced: Advanced concepts
     start: Getting started
     steps: Workflow steps
+    deployments: Deployments
     contribute: Contributing
   ja-jp:
     basic: 基本的な概念
     advanced: 応用コンセプト
     start: Bolt 入門ガイド
     # TODO: translate this title
     steps: Workflow steps
+    # TODO: translate this title
+    deployments: Deployments
     contribute: 貢献
 
 # Metadata

docs/_deployments/heroku.md

@@ -0,0 +1,265 @@
+---
+title: Deploying to Heroku
+order: 0
+slug: heroku
+lang: en
+layout: tutorial
+permalink: /deployments/heroku
+redirect_from:
+  - /deployments
+---
+# Deploying to Heroku
+
+<div class="section-content">
+This guide will walk you through preparing and deploying a Slack app using [Bolt for JavaScript](/bolt-js) and the [Heroku platform](https://heroku.com/). Along the way, we’ll download a Bolt Slack app, prepare it for Heroku, and deploy it.
+</div>
+
+When you’re finished, you’ll have this ⚡️[Getting Started with Heroku app][getting-started-with-heroku-app] to run, modify, and make your own.
+
+---
+
+### Get a Bolt Slack app
+
+If you haven't already built your own Bolt app, you can use our [Getting Started guide][getting-started-guide] or clone the template app below:
+
+```shell
+git clone https://github.com/slackapi/bolt-js-getting-started-app.git
+```
+
+After you have a Bolt app, navigate to its directory:
+
+```shell
+cd bolt-js-getting-started-app/
+```
+
+Now that you have an app, let's prepare it for Heroku.
+
+---
+
+### Prepare the app for Heroku
+
+Heroku is a flexible platform that requires some configuration to host your app. In this section, we'll update your Bolt app to support Heroku.
+
+**1. Use a Git repository**
+
+Before you can deploy your app to Heroku, you'll need a Git repository. If you aren't already using Git, you'll need to [install Git](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git) and [create a Git repository](https://git-scm.com/book/en/v2/Git-Basics-Getting-a-Git-Repository).
+
+> 💡 Skip this step if you used `git clone` in the previous section because you already have a Git repository.
+
+**2. Add a Procfile**
+
+Every Heroku app uses a special file called `Procfile` that tells Heroku how to start your app. A Bolt Slack app will be started as a web server with a public web address.
+
+Create a new file called `Procfile` (without any extension) in your app's root directory anad paste the following:
+
+```yaml
+web: node app.js
+```
+
+Once you've saved the file, let's commit it to your Git repository:
+
+```shell
+git add Procfile
+git commit -m "Add Procfile"
+```
+
+> 💡 Are you following this guide with an existing Bolt app? If so, please review the guide on [preparing a codebase for Heroku](https://devcenter.heroku.com/articles/preparing-a-codebase-for-heroku-deployment#4-listen-on-the-correct-port) to listen on the correct port.
+
+---
+
+### Setup the Heroku tools
+
+Now we can set up the Heroku tools on your local machine. These tools will help you manage, deploy, and debug your app on Heroku's platform.
+
+**1. Install the Heroku CLI**
+
+The Heroku tools are available as a Command Line Interface (CLI). Go ahead and [install the Heroku CLI for macOS, Windows, or Linux](https://devcenter.heroku.com/articles/getting-started-with-nodejs#set-up). On macOS, you can run the command:
+
+```shell
+brew install heroku/brew/heroku
+```
+
+Once the install is complete, we can test the Heroku CLI by displaying all of the wonderful commands available to you:
+
+```shell
+heroku help
+```
+
+> 💡 If the `heroku` command is not found, refresh your path by opening a new terminal session/tab.
+
+**2. Log into the Heroku CLI**
+
+The Heroku CLI connects your local machine with your Heroku account. [Sign up for a free Heroku account](https://heroku.com) and then log into the Heroku CLI with the following command:
+
+```shell
+heroku login
+```
+> 💡 If you're behind a firewall, you may need to [set the proxy environment variables](https://devcenter.heroku.com/articles/using-the-cli#using-an-http-proxy) for the Heroku CLI.
+
+**3. Confirm you're logged into the Heroku CLI**
+
+Check that you're logged in by displaying the account currently connected to your Heroku CLI:
+
+```shell
+heroku auth:whoami
+```
+
+You should now be set up with the Heroku tools! Let's move on to the exciting step of creating an app on Heroku.
+
+---
+
+### Create an app on Heroku
+
+It’s time to [create a Heroku app](https://devcenter.heroku.com/articles/creating-apps) using the tools that you just installed. When you create an app, you can choose a unique name or have it randomly generated.
+
+> 💡 You can [rename a Heroku app](https://devcenter.heroku.com/articles/renaming-apps) at any time, but you may change your Git remote and public web address.
+
+**1. Create an app on Heroku**
+
+Create an app on Heroku with a unique name:
+
+```shell
+heroku create my-unique-bolt-app-name
+```
+
+or, have some fun with a random name:
+
+```shell
+heroku create
+# Creating sharp-rain-871... done, stack is heroku-18
+# https://sharp-rain-871.herokuapp.com/ | https://git.heroku.com/sharp-rain-871.git
+```
+
+After your app is created, you'll be given some information that we'll use in the upcoming sections. In the example above:
+
+- App name is `sharp-rain-871`
+- Web address is `https://sharp-rain-871.herokuapp.com/`
+- Empty Git remote is `https://git.heroku.com/sharp-rain-871.git`
+
+**2. Confirm Heroku Git remote**
+
+The Heroku CLI automatically adds a Git remote called `heroku` to your local repository. You can list your Git remotes to confirm `heroku` exists:
+
+```shell
+git remote -v
+# heroku	https://git.heroku.com/sharp-rain-871.git (fetch)
+# heroku	https://git.heroku.com/sharp-rain-871.git (push)
+```
+
+**3. Set environment variables on Heroku**
+
+Now you'll need to add your Slack app credentials to your Heroku app: 
+
+```shell
+heroku config:set SLACK_SIGNING_SECRET=<your-signing-secret>
+heroku config:set SLACK_BOT_TOKEN=xoxb-<your-bot-token>
+```
+
+> 💡 If you don't know where to find your credentials, please read about [exporting your signing secret and token](/bolt-js/tutorial/getting-started#tokens-and-installing-apps) in the Getting Started guide.
+
+Now that we have prepared your local app and created a Heroku app, the next step is to deploy it!
+
+---
+
+### Deploy the app
+
+To deploy the app, we're going to push your local code to Heroku, update your Slack app's settings, and say "hello" to your Heroku app. ✨
+
+**1. Deploy the app to Heroku**
+
+When deploying an app to Heroku, you'll typically use the `git push` command. This will push your code from your local repository to your `heroku` remote repository.
+
+You can now deploy your app with the command:
+
+```shell
+git push heroku main
+```
+
+> 💡 Heroku deploys code that's pushed to the [master or main branches](https://devcenter.heroku.com/articles/git-branches). Pushing to other branches will not trigger a deployment.
+
+Finally, we need to start a web server instance using the Heroku CLI:
+
+```shell
+heroku ps:scale web=1
+```
+
+**2. Update your Slack app's settings**
+
+Now we need to use your Heroku web address as your **Request URL**, which is where Slack will send events and actions.
+
+Get your Heroku web address with the following command:
+
+```shell
+heroku info
+# ...
+# Web URL: https://sharp-rain-871.herokuapp.com/
+```
+
+In our example, the web address is `https://sharp-rain-871.herokuapp.com/`.
+
+Head over to the [Slack App page](https://api.slack.com/apps) and select your app name. Next, we'll update your **Request URL** in two locations to be your web address.
+
+> 💡 Your **Request URL** ends with `/slack/events`, such as `https://sharp-rain-871.herokuapp.com/slack/events`.
+
+First, select **Interativity & Shortcuts** from the side and update the **Request URL**:
+
+![Interactivity & Shortcuts page](../assets/interactivity-and-shortcuts-page.png "Interactivity & Shortcuts page")
+
+Second, select **Event Subscriptions** from the side and update the **Request URL**:
+
+![Event Subscriptions page](../assets/event-subscriptions-page.png "Event Subscriptions page")
+
+> 💡 Free Heroku apps sleep when inactive. 💤 If your verification fails, please try it again immediately.
+
+**3. Test your Slack app**
+
+Your app is now deployed and Slack is updated, so let's try it out!
+
+Open a Slack channel that your app has joined and say "hello" (lower-case). Just like in the [Getting Started guide](/bolt-js/tutorial/getting-started#sending-and-responding-to-actions), your app should respond back. If you don't receive a response, check your **Request URL** and try again.
+
+---
+
+### Deploy an update
+
+As you continue building your Slack app, you'll need to deploy updates. A common flow is to make a change, commit it, and then push it to Heroku.
+
+Let's get a feel for this by updating your app to respond to a "goodbye" message. Add the following code to `app.js` ([source code on GitHub](https://github.com/slackapi/bolt-js/blob/main/examples/getting-started-with-heroku/app.js)):
+
+```javascript
+// Listens to incoming messages that contain "goodbye"
+app.message('goodbye', async ({ message, say }) => {
+  // say() sends a message to the channel where the event was triggered
+  await say(`See ya later, <@${message.user}> :wave:`);
+});
+```
+
+Commit the changes to your local Git respository:
+
+```shell
+git commit -am "Say 'goodbye' to a person"
+```
+
+Deploy the update by pushing to your `heroku` remote:
+
+```shell
+git push heroku main
+```
+
+When the deploy is complete, you can open a Slack channel that your app has joined and say "goodbye" (lower-case). You should see a friendly farewell from your Slack app.
+
+---
+
+### Next steps
+
+You just deployed your first ⚡️[Bolt for JavaScript app to Heroku][getting-started-with-heroku-app]! 🚀
+
+Now that you've deployed a basic app, you can start exploring how to customize and monitor it. Here are some ideas of what to explore next:
+
+- Brush up on [how Heroku works](https://devcenter.heroku.com/articles/how-heroku-works) and understand the [limitations of a free Heroku app](https://devcenter.heroku.com/articles/free-dyno-hours).
+- Extend your app with [Bolt's Basic Concepts](/bolt-js/concepts#basic) and [Heroku's Add-ons](https://elements.heroku.com/addons).
+- Learn about logging in [Bolt's Advanced Concepts](/bolt-js/concepts#logging) and how to [view log messages in Heroku](https://devcenter.heroku.com/articles/getting-started-with-nodejs#view-logs).
+- Get ready for primetime with [how to scale your Heroku app](https://devcenter.heroku.com/articles/getting-started-with-nodejs#scale-the-app).
+
+[getting-started-guide]: /bolt-js/tutorial/getting-started
+[getting-started-with-heroku-app]: https://github.com/slackapi/bolt-js/tree/main/examples/getting-started-with-heroku
+[getting-started-with-heroku-app]: https://github.com/slackapi/bolt-js/tree/main/examples/getting-started-with-heroku

docs/_includes/sidebar.html

@@ -62,15 +62,29 @@
     {% endfor %}
   </ul>
 
+  {% assign deployments_sections = site.deployments | sort: "order" | where: "lang", page.lang %}
+  {% if deployments_sections.size > 0 %}
+    <ul class="sidebar-section">
+      <a href="{{ site.url | append: site.baseurl | append: localized_base_url }}/deployments">
+        <li class="title">{{ site.t[page.lang].deployments }}</li>
+      </a>
+      {% for section in deployments_sections %}
+        <a href="{{ site.url | append: site.baseurl | append: localized_base_url }}/deployments/{{ section.slug }}">
+          <li>{{section.title}}</li>
+        </a>
+      {% endfor %}
+    </ul>
+  {% endif %}
+
   <ul class="sidebar-section">
-    {% assign tutorials = site.tutorials | where: "lang", page.lang | where_exp: "tutorial", "tutorial.order > 0" %} {%
-    for tutorial in tutorials %}
+    {% assign tutorials = site.tutorials | where: "lang", page.lang | where_exp: "tutorial", "tutorial.order > 0" %}
+    {% for tutorial in tutorials %}
     <a href="{{ site.url | append: site.baseurl | append: localized_base_url }}/tutorial/{{ tutorial.slug }}">
       <li class="title">{{tutorial.title}}</li>
     </a>
     {% endfor %}
-    <a href="https://github.com/SlackAPI/bolt-js/blob/master/.github/contributing.md"
-      ><li class="title">{{ site.t[page.lang].contribute }}</li></a
-    >
+    <a href="https://github.com/SlackAPI/bolt-js/blob/master/.github/contributing.md">
+      <li class="title">{{ site.t[page.lang].contribute }}</li>
+    </a>
   </ul>
 </div>

examples/getting-started-with-heroku/.gitignore

@@ -0,0 +1,3 @@
+# node / npm
+node_modules/
+package-lock.json

examples/getting-started-with-heroku/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 Slack Technologies, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

examples/getting-started-with-heroku/Procfile

@@ -0,0 +1 @@
+web: node app.js