Generate dist catalog only for releases

[krzema12]

Currently, we keep the dist catalog containing all JARs on the main branch, which means that:

• it's more problematic for contributors (and me as a maintainer) to make changes because most of them require regenerating the dist directory with a special workflow (or manually)
• Renovate cannot automatically merge the PRs

The idea is to generate this directory only for releases. We could have a workflow that is run on main and:

• creates a commit with the dist directory, and pushes it
• creates a tag with the requested name, and pushes it
• creates a GitHub release

[krzema12]

The main part is generally done, what's left is:

• setting the major version tag to the same commit that has just been marked with the patch version tag
• optionally, creating a GitHub release