bugfix added release-event to valid docker-build ci :heartbeat:

[Lukas113]

bugfix: enable docker-builds on release-event on ci

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 65.96%. Comparing base (8df295d) to head (bf67944).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #549 +/- ## ======================================= Coverage 65.96% 65.96% ======================================= Files 49 49 Lines 4792 4792 ======================================= Hits 3161 3161 Misses 1631 1631 ```

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[Lukas113]

docker-build failed for release. The reasons were:

• The CI wasn't prepared for the release-event (see failed build-docker-image)
• The way to go to the correct git-commit didn't work in case GIT_REV was a tag and not a commit-hash (see failed build-docker-image)

The changes should resolve these issues. However, for some reason, I can't test it on this branch because I can't find the branch on the Action to trigger it (see image below)