Migrate Travis CI tasks to GitHub Actions

[eason9487]

Changes proposed in this Pull Request:

Somehow seems all repos under Woo were stopped CI tasks on Travis CI. This PR migrates CI tasks to GitHub Actions:

• Run PHP unit tests
• Run JavaScript unit tests
• Check PHP coding standards
• Lint JavaScript and CSS
• Check bundle size
• Add status badges to README

Additional notes

Since the WC_VERSION in install-wp-tests.sh doesn't take from a command param, the WC_VERSION of matrix values in .travis.yml have never been used when running PHP unit tests on Travis CI. Therefore, I didn't migrate the matrix of specified WC_VERSION such as WC_VERSION=5.2.

google-listings-and-ads/bin/install-wp-tests.sh

Line 23 in 56ee88b

WC_VERSION=trunk

google-listings-and-ads/.travis.yml

Lines 32 to 37 in 56ee88b

	- WC_LATEST=trunk
	matrix:
	- WP_VERSION="${WP_LATEST}" WC_VERSION="${WC_LATEST}"
	- WP_VERSION="${WP_LATEST}" WC_VERSION=5.2
	- WP_VERSION=5.7 WC_VERSION=5.2
	- WP_VERSION=5.6 WC_VERSION=5.2

Screenshots:

Detailed test instructions:

Go to the Checks tab for details

Changelog entry

[tomalec]

WDYT of using the node version from .nvmrc? So we will not hardcode it in so many places, and have to manually change on every update?
actions/setup-node#32

[eason9487]

WDYT of using the node version from .nvmrc? So we will not hardcode it in so many places, and have to manually change on every update?
actions/setup-node#32

Currently, there should be only one place that uses a hardcode node version:

google-listings-and-ads/.github/workflows/bundle-size.yml

Lines 20 to 24 in 56ee88b

	- name: Set up Node
	uses: actions/setup-node@v2
	with:
	node-version: "12.21.0"
	cache: "npm"

The reason is that I recalled several discussions about the node version used for building a bundle, and from slack I found that node 12.21.0 was mentioned a few times, so I specified it in the bundle-size action:

• p1622120832186300-slack-C01E9LB4X61
• p1622194602214700-slack-C01E9LB4X61

If that's not an issue anymore, then we could remove the actions/setup-node step in the bundle-size action, because in the runs-on: ubuntu-latest environment, the built-in node is already the LTS version.

[tomalec]

I'd rather make sure it's set to the exact same version as https://github.com/woocommerce/google-listings-and-ads/blob/develop/.nvmrc, which is the version that was used on Travis before, but more importantly, that's the version we use locally to build (if we use NVM). Which has the benefit of keeping all the parties at the same version, and a single point to set it up.

If the issue with building with lts would pop up, we should rather fix the issue, not downgrade, not to makes lag too far behind.

[tomalec]

Since the WC_VERSION in install-wp-tests.sh doesn't take from a command param, the WC_VERSION of matrix values in .travis.yml have never been used when running PHP unit tests on Travis CI. Therefore, I didn't migrate the matrix of specified WC_VERSION such as WC_VERSION=5.2.

I recently learned (naturally from reading the code, not from the docs 😬), that WC_VERSION is the only way to set the WC version for E2E test, so I think we would need them once we will run E2E against a range of versions. (For example to mitigate Dependency Extraction Plugin related bugs)

Edit: but adding E2E tests to CI could be a separate PR.

[tomalec]

💅 I wonder If we could somehow DRY it, as this bit repeats in many other workflows.

[JPry]

Doing a search about this led me to this issue as well as Composite Actions. I didn't delve deeply enough to see how that might play out with our actions.

[eason9487]

Adjusted by 148dd5f, b86b5fe, and e7467f7. And it needs some workarounds due to lack of if syntax in composite actions. (ref: actions/runner#834)

[tomalec]

❓
Is this a dependency needed for GH Actions, or something that was missing before?

[eason9487]

That's the problem stuck me for the longest before. I got error when running composer test-unit on my local and GHA. Not sure why it can run successfully on Travis CI.

> ./vendor/bin/phpunit
Error: The PHPUnit Polyfills library is a requirement for running the WP test suite.
If you are trying to run plugin/theme integration tests, make sure the PHPUnit Polyfills library (https://github.com/Yoast/PHPUnit-Polyfills) is available and either load the autoload file of this library in your own test bootstrap before calling the WP Core test bootstrap file; or set the absolute path to the PHPUnit Polyfills library in a "WP_TESTS_PHPUNIT_POLYFILLS_PATH" constant to allow the WP Core bootstrap to load the Polyfills.

If you are trying to run the WP Core tests, make sure to set the "WP_RUN_CORE_TESTS" constant to 1 and run `composer install` before running the tests.
Once the dependencies are installed, you can run the tests using the Composer-installed version of PHPUnit or using a PHPUnit phar file, but the dependencies do need to be installed whichever way the tests are run.
Script ./vendor/bin/phpunit handling the test-unit event returned with error code 1

Finally, I ended up this problem by adding the yoast/phpunit-polyfills dependency.

[eason9487]

I'd rather make sure it's set to the exact same version as https://github.com/woocommerce/google-listings-and-ads/blob/develop/.nvmrc, which is the version that was used on Travis before, but more importantly, that's the version we use locally to build (if we use NVM). Which has the benefit of keeping all the parties at the same version, and a single point to set it up.

If the issue with building with lts would pop up, we should rather fix the issue, not downgrade, not to makes lag too far behind.

Tested build bundle with LTS version and it works well. I removed the specified node version 12.21.0.

And since the built-in node version of runs-on: ubuntu-latest is the same as the lts/* version (in .nvmrc), I think we could just use it without installing the same version via shivammathur/setup-php@v2 again. If still have concern about it, we can easily add it later through the prepare-node action then.

[eason9487]

I forgot to update the status badges within README before. Added by 9137422.

[tomalec]

LGTM :)