Support OCI Artifacts as a source

[vic3lord]

Is your feature request related to a problem? Please describe. The feature will allow us to use a generic container and yet pull artifacts from our OCI registry, today we build a docker image using FROM migrate/migrate and upload the migrations to the container as a side car to the main container, it runs as an initContainer in Kubernetes, this way the CI builds and bundles migrations + code for the same version

Describe the solution you'd like Would love to see support for OCI Artifacts This way we can use a generic container and still be able to bundle migrations into the CI process, we can do GitHub/GCS etc but that would lose the connection we have today that all artifacts sit together in the registry each under its own service

e.g: some-registry/some-service:1.2.3 and some-registry/some-service/migrations:1.2.3

Describe alternatives you've considered Bundling into a custom container