Update documentation for Ubuntu PPA

docs/make-release.md

@@ -1,5 +1,7 @@
 # Checklist for making a release
 
+## In the release PR
+
 - [ ] Updated version code in `src/common/Version.hpp`
 - [ ] Updated version code in `CMakeLists.txt`  
        This can only be "whole versions", so if you're releasing `2.4.0-beta` you'll need to condense it to `2.4.0`
@@ -8,4 +10,13 @@
 - [ ] Updated version code in `.CI/chatterino-installer.iss`
 - [ ] Update the changelog `## Unreleased` section to the new version `CHANGELOG.md`  
        Make sure to leave the `## Unreleased` line unchanged for easier merges
-- [ ] Push directly to master :tf:
+
+## After the PR has been merged
+
+- [ ] Tag the release
+- [ ] Manually run the [create-installer](https://github.com/Chatterino/chatterino2/actions/workflows/create-installer.yml) workflow.  
+       This is only necessary if the tag was created after the CI in the main branch finished.
+- [ ] Start a manual [Launchpad import](https://code.launchpad.net/~pajlada/chatterino/+git/chatterino) - scroll down & click Import Now
+- [ ] Make a PPA release to [this repo](https://git.launchpad.net/~pajlada/+git/chatterino-packaging/) with the `debchange` command.  
+       `debchange -v 2.4.0` then add the changelog entries  
+       `debchange --release` then change the distro to be `unstable`