Automate releasing Knot.x

[malaskowski]

Context The goal of this task is to automate releasing Knot.x so that most of the steps are done by tools and releasing Knot.x is time efficient (e.g. one-click release).

Describe the solution you'd like Currently, we have release scripts, that are able to release new version of Knot.x, push it to the OSSH Staging repo and update corresponding repositories with new tag and development version.

We need a fully automated build that will be able to prepare release and publish, prepare summary in a form of release notes and finally prepare repositories to the next development version.

Automated release process sequence

• [git] clone repositories (preferably shallow copy)
• [?] set release version
• [gradle/maven/docker] publish module
  • build (jar/zip/docker image)
  • test
  • sign
  • upload (jar/zip to OSS staging repository, image to dockerhub)
• [github] update CHANGELOG.md
• [git] create a version tag and push to the repository with all changes
• [git] set the next development version and push to the repository
• [web] update the website after the release
  • create release branch
  • create release notes summary in the blog
  • update version on the Home page
  • update the Download page
  • create PR to knotx-website

Manual actions still required:

• prerequisites check (gpg, passwords, etc.)
• approve PR to knotx-website

Optional automatization:

• promoting artifacts to public maven repo
• discard from staging maven repo when fail

Additional requirements:

• the release process is logged to a version.release.log so that it can be reviewed later to track the whole process
• whole release process should fail fast after any error
• release process should be validated regularly (e.g. by some pipeline)
• dry-run option, that goes through all steps without making/persisting actual changes