Consider setting broker dockerfile base image back to latest or implement github action

[olaals]

Describe the improvement you would like to see
Had to set the broker base image to a specific version due to a segmentation fault with 2.1.0 (which was the latest).

We should set it back to latest, or better: implement a github action that periodically creates a pull request to bump version.

How will this change existing functionality?
No change if we go back to latest.

How will this improvement affect the current Threat Model?
https://devopsunlocked.dev/stop-using-docker-latest-tag/
We should update the version of the base image, but using latest tag is not the best practice either, it might be okay for our usecase though.

[tsundvoll]

Can Trivy be used for looking for latest updates?

[github-actions]

This issue has been automatically marked as stale due to inactivity.