Take ownership of Maven archetypes

AT:

• The codebase https://github.com/camunda/camunda-archetypes is managed by the dev team (github access rights)
• Set up regular side-project CI
• In the release process, we have a step to update the archetypes to the new Camunda release
  • Update Camunda version in code
  • Resolve any problems documented in Camunda BPM update guide and simple other problems (e.g. bumping dependencies)
  • In case of more complex problems, update can be postponed (e.g. if the involved community extensions are not compatible with the new Camunda release - process test coverage)
• Apply a standalone versioning to the archetypes, e.g. begin at 1.0.0; document compatibility
• Create one template repository for each archetype
• Write shell script that updates a template repository from a released Maven archetype and add it to release procedure
• Optional: Automate that step in CI

Side notes:

• The general strategy is that the dev team will maintain the codebase with future Camunda versions and do releases. The consulting team will develop the content, e.g. new archetypes
• There will be a DRI from consulting side who can be approached with any content-related questions or in case the version update is not trivial (accessible via a Slack role; Ragnar takes care of setting that up)
• Falko can do a hand-over session