Release v21.4.2/v21.4.1 packages and release

[Dexus]

Summary

Releases the latest version and publish the Docker Images to github.com and docker.com registries.

• 228

• 225

• 229

PR ONLY

PRs will publish only to ghcr.io not to hub.docker.com

Checklist

Delete any items that are not applicable to this PR.

• [x] Update Documentation was added for features that require explanation or tutorials

Enhancements:

• Auto build docker images and release them to ghcr.io and hub.docker.com via #228
• Add possiblities to use own ssl certificates #229 fixes #195

  Fixed Bug/Issues solved:

• fixes #226

Braking Changes:

[Dexus]

@pixelsquared anything on your side against the merge?