bad architecture metadata in k8s.gcr.io images

[24sama]

What steps did you take and what happened:
The arch metadata in the k8s.gcr.io/cluster-api/xxx are incorrect.
For example:

$ docker pull --platform linux/arm64/v8 k8s.gcr.io/cluster-api/cluster-api-controller:v1.2.0
$ docker inspect k8s.gcr.io/cluster-api/cluster-api-controller:v1.2.0 | grep Arch                                                                                                                                        
        "Architecture": "amd64",

$ docker pull --platform linux/ppc64le k8s.gcr.io/cluster-api/cluster-api-controller:v1.2.0
$ docker inspect k8s.gcr.io/cluster-api/cluster-api-controller:v1.2.0 | grep Arch                                                                                                                                            
        "Architecture": "amd64",

The other images are correct:

$ docker pull --platform linux/arm64/v8 k8s.gcr.io/pause:3.7
$ docker inspect k8s.gcr.io/pause:3.7 | grep Arch                                                                                                                                                                            
        "Architecture": "arm64",

What did you expect to happen:

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• Cluster-api version: v1.2.0
• minikube/kind version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):

/kind bug
[One or more /area label. See https://github.com/kubernetes-sigs/cluster-api/labels?q=area for the list of labels]

[k8s-ci-robot]

@24sama: This issue is currently awaiting triage.

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[24sama]

Has anyone encountered this problem?

[chrischdi]

Interesting finding.

This comes from

cluster-api/Dockerfile

Line 63 in 9663ed6

FROM gcr.io/distroless/static:nonroot

which then will use the platform it is building on.

We already have the ARCH build-arg which could get used to define --platform in the FROM line which fixes this.

I will create a PR shortly :-)