Add External Container Registry Harbor

Feature

Summary

This MR enables the external CR “Harbor” at harbor.gwdg.de that offers persistent and better container scanning (check for vulnerabilities).

Compliance to “Definition of Done”

• Unit tests passed
• Code reviewed
• Product Owner accepts the User Story

Documentation

• I updated the README (if applicable)
• I provided my functions with appropriate documentation
• I updated existing documentation

Tests

Are we able to test this new feature?

• Yes, everything can be done via unit tests.
• Yes, you can test by following these steps: …
• No, it is not possible.

Changelog

• I added a statement to the CHANGELOG.

Version number

• I bumped the version number in build.properties.

Closes

Closes

Logs and Screenshots

/cc Mathias Göbel, Frank Schneider, Michelle Weidling