workflow zum bauen für ein beliebiges target

[github-actions[bot]]

Please complete the following tasks before merging this PR:

• [x] update dependencies (cargo update + check cargo outdated)
• [x] update licenses folder
  • clean current licenses
  • run fetch_licenses.py
  • commit result
  • check test output if licenses are up to date
• [x] update Changelog.md, so all included changes appear under the section
• [x] update zugkontrolle.desktop

[spamviech]

Please complete the following tasks before merging this PR:

* [x]  update dependencies (`cargo update` + check `cargo outdated`)

* [x]  update `licenses` folder

  * clean current licenses
  * run `fetch_licenses.py`
  * commit result
  * check test output if licenses are up to date

* [x]  update `Changelog.md`, so all included changes appear under the  section

* [x]  update `zugkontrolle.desktop`

Not relevant, only a new workflow