Support fetching release notes for Docker Git URL fragment sources

[yeikel]

Is there an existing issue for this?

• I have searched the existing issues

Feature description

Currently, when a Docker image points to a specific Git commit, tag, or branch with a subdirectory, release notes are not fetched. Supporting this format would improve visibility into upstream changes and provide users with clearer context during updates.

Example source format

docker buildx imagetools inspect golang:1.25.6-alpine3.23

  Name:        docker.io/library/golang:1.25.6-alpine3.23@sha256:d814f1814dcdcbcab4adb14695aecedfc02d4d7d4fae0b28e3dfa4055dfe41b1
  MediaType:   application/vnd.oci.image.manifest.v1+json
  Platform:    unknown/unknown
  Annotations:
    com.docker.official-images.bashbrew.arch: riscv64
    vnd.docker.reference.digest:              sha256:afeffef75477be3e77cd161adcdf0d433ea04935ae5956076e146f6b2c562969
    vnd.docker.reference.type:                attestation-manifest

  Name:        docker.io/library/golang:1.25.6-alpine3.23@sha256:cd248b3ba8e0da54b1ff40cf4e839641dd615cff90d1b09de77f4e01c28da479
  MediaType:   application/vnd.oci.image.manifest.v1+json
  Platform:    linux/s390x
  Annotations:
    com.docker.official-images.bashbrew.arch: s390x
    org.opencontainers.image.base.digest:     sha256:2a4da79bcc2c8200c56298571afb57d62e8dbbf7e1e134b3ddc2d5f881453dc7
    org.opencontainers.image.base.name:       alpine:3.23
    org.opencontainers.image.created:         2026-01-28T03:09:24Z
    org.opencontainers.image.revision:        1c0ced42456a245f7952d1d3099c7bc51da8ef00
    org.opencontainers.image.source:          https://github.com/docker-library/golang.git#1c0ced42456a245f7952d1d3099c7bc51da8ef00:1.25/alpine3.23
    org.opencontainers.image.url:             https://hub.docker.com/_/golang
    org.opencontainers.image.version:         1.25.6-alpine3.23

  Name:        docker.io/library/golang:1.25.6-alpine3.23@sha256:0f2648eb2a57f4f8e25a3cf6328692fb023dca31bc99b70a9fe6521aa9728ce1
  MediaType:   application/vnd.oci.image.manifest.v1+json
  Platform:    unknown/unknown
  Annotations:
    com.docker.official-images.bashbrew.arch: s390x
    vnd.docker.reference.digest:              sha256:cd248b3ba8e0da54b1ff40cf4e839641dd615cff90d1b09de77f4e01c28da479
    vnd.docker.reference.type:                attestation-manifest

Expected behavior

• Detect the Git reference (commit/tag/branch) from the fragment
• Resolve the corresponding repository release (when applicable)
• Fetch release notes to users during updates

[yeikel]

I will be working on this. I'll send a draft sometime next week