Add an endpoint that returns list of distribution which will be presented in the UI dropdown on the Immutable page. These should be part of some configuration file ideally which we can easily maintain. Something like:

• id: rhel-10.0
  name: "Image Mode for RHEL 10.0"
  url: "https://ecr-442.us-east1.amazonaws.com/registry/rhel-10.0:latest"

The hostname should probably be in a global configuration.

The final bootc ref will be constructed from this configuration + "-" and image name will be appended to the tag. This is not yet clear how are we gonna setup image names and tags in the registry, there are several options like "rhel-10.0:latest-ec2" or "rhel-10:0-ec2" or "rhel-10.0-ec2". This will be decided when we are done with the derived container publishing process.

Add bootc ref to Image Request. It will be the name from the configuration above. Return an error if it is not recognized bootc name.

Pass the bootc ref into composer API.

Ensure the field is properly stored and retrieved within blueprint.