Experiment: feature-based images

[s373r]

Description

This experiment offers the ability to create images for a specific feature without waiting for a release.

To build an image, you need to add a git tag in the format feature-$NAME-v$VERSION, or for example feature-private-dataset-v1.

Checklist before requesting a review

• [x] Unit and integration tests added ❌ it's a CI change
• [x] Compatibility:
  • [x] Network APIs: ✅
  • [x] Workspace layout and metadata: ✅
  • [x] Configuration: ✅
  • [x] Container images: :warning: Added new images
• [x] Documentation:
  • [ ] Changelog: ✅
  • [x] Public documentation: ❌ not needed
• [x] Downstream effects:
  • [x] kamu-node: ❌ not needed