FIX: Pipeline jobs "style" and "cert" depend on a built image.

Summary

Just a few pipeline job dependency fixes .

Focus

This should work for all trigger cases.

Test Environment

Look at the pipelines

Check List for the Author

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• All automated tests pass
• Reference related issues caosdb-pylib#75 (closed) (somewhat related)
• Up-to-date CHANGELOG.md (or not necessary)
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.