Improve release process to ensure we have stable & consistent format (mediaType)

[ahrtr]

What would you like to be added?

I checked several etcd released images, different images may have different mediaType. I think the reason could be different release persons have different docker versions. FYI. etcd has a release process, but release persons use their local env to build/release etcd.

In the long run, we should improve our release process to ensure we have stable & expected images. cc @ivanvc @joshjms

Not sure how Kubernetes release team generate the images?

3.6.0 application/vnd.docker.distribution.manifest.list.v2+json
3.6.1 application/vnd.docker.distribution.manifest.list.v2+json
3.6.2 application/vnd.oci.image.index.v1+json
3.6.3 application/vnd.oci.image.manifest.v1+json
3.6.4 application/vnd.docker.distribution.manifest.v2+json
3.6.5 application/vnd.docker.distribution.manifest.list.v2+json
3.6.6 application/vnd.oci.image.manifest.v1+json

3.5.22 application/vnd.oci.image.index.v1+json
3.5.23 application/vnd.docker.distribution.manifest.list.v2+json
3.5.24 application/vnd.docker.distribution.manifest.list.v2+json
3.5.25 application/vnd.oci.image.index.v1+json

Note it's breaking Kubeadm test case, refer to kubernetes/kubernetes#135697

References:

• Release OCI container images instead of docker kubernetes/kubernetes#121742
• https://docs.docker.com/build/exporters/#oci-media-types

Why is this needed?

.

[serathius]

Kubernetes uses Cloud Build to build images. Example: https://github.com/kubernetes-sigs/metrics-server/blob/master/cloudbuild.yaml

Short term mitigation could be to validate local docker version.

[upodroid]

This should all be resolved by #20915

[ahrtr]

Kubernetes uses Cloud Build to build images.

This should all be resolved by #20915

thx both.

It seems that we need to resolve #20918 first to move #20915 forward. @ivanvc @joshjms

[fuweid]

I am not sure it's builder issue. the application/vnd.oci.image.index.v1+json and application/vnd.docker.distribution.manifest.list.v2 are the same... they're using index or list to ship multiple platforms' manifest for content addressing.