Separated release and publish CI step

[albertmoravec]

Separated release and publish CI pipeline into two steps:

• release - runs on every commit to master, except for chore(release) commits done by semantic-release
• publish - runs on every version tag push

Release is now entirely handled by semantic-release. New version is calculated, changelog is generated, pubspec.yaml updated, new version tag is pushed and finally a Github release is created.

To trigger the publish pipeline from another Github Action (in this case the release action), the version tag push must be done using PAT (personal access token) of a user, not using the pipeline token. The release pipeline expects secrets.RELEASE_PAT to be present.

[marianhlavac]

I'm not sure if this will work, have you checked it's working?

[albertmoravec]

Seems like I managed to fully automate the release process. Updated the PR description accordingly, please check again.

[marianhlavac]

Hip-hip-hurray! 🙌 The best way to test this is to merge it and release a new version, so let's try it.