Add releasing documentation

[adangel]

1. Rename milestone "next" to new version, e.g. "v1.0.1", close it, and create a new "next" milestone
2. Push a tag with a full semantic version, e.g. "v1.0.1"
3. Draft a new github release. Make sure to check the checkbox "Publish this Action to the GitHub Marketplace". Copy release notes from CHANGELOG.md. And finally publish the release.
4. The publish workflow will start and create/update tags "v1" and "v1.0"
5. Run Regenerate CHANGELOG and dist workflow manually to update CHANGELOG.md
6. Update starter workflow: https://github.com/actions/starter-workflows/blob/main/code-scanning/pmd.yml
   See older PRs for examples:
   • Update pmd to v1.1.0 actions/starter-workflows#1324
   • Update pmd to v1.2.0 actions/starter-workflows#1397
   • Update pmd to v1.4.0 actions/starter-workflows#1988
   • Update pmd to 2.0.0 actions/starter-workflows#2346