[WIP] Use multiarch Golang builder

[mgencur]

What this PR does / why we need it:

Support ARM and be able to build Serving images in on a heterogenous cluster in CI.

Link to Slack thread where this new image was mentioned.

Note: The new image is available only in CI. If somebody wants to use those Dockerfiles and built images locally they need to have an authfile in json format (it's possible to download it from a running CI job).

Image metadata:

skopeo inspect --raw --authfile=dockerconfig.json docker://registry.ci.openshift.org/ocp/builder:rhel-9-golang-1.21-builder-multi-openshift-4.16
{
    "manifests": [
        {
            "digest": "sha256:8c44fc7f6f3fcdd844f94f7aeba3e3fabb723943ce04dfce449960bf9c71a815",
            "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
            "platform": {
                "architecture": "amd64",
                "os": "linux"
            },
            "size": 922
        },
        {
            "digest": "sha256:41a80f39d422fedb68d3462db6050ec0e19b2351f956cd6f97f624f7947684fb",
            "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
            "platform": {
                "architecture": "arm64",
                "os": "linux"
            },
            "size": 922
        },
        {
            "digest": "sha256:7d6f9f7dd670f9ccb87d369ea52081937faa1e18b66a3187e16ef2f2ef3fd336",
            "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
            "platform": {
                "architecture": "ppc64le",
                "os": "linux"
            },
            "size": 922
        },
        {
            "digest": "sha256:21957552890abebfdc42eee30982c690aa16e0c7d5032e3c063201a29ec055e7",
            "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
            "platform": {
                "architecture": "s390x",
                "os": "linux"
            },
            "size": 922
        }
    ],
    "mediaType": "application/vnd.docker.distribution.manifest.list.v2+json",
    "schemaVersion": 2
}

Which issue(s) this PR fixes:

JIRA: https://issues.redhat.com/browse/SRVKS-1024

Does this PR needs for other branches:

release-v1.13, main

/cherry-pick release-v1.13
/cherry-pick main

Does this PR (patch) needs to update/drop in the future?:

NONE

[openshift-ci]

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[mgencur]

I'm not sure if the new images are used in tests running on this PR. Maybe we also need to update the CI config:https://github.com/openshift/release/blob/master/ci-operator/config/openshift-knative/serving/openshift-knative-serving-release-v1.12__414.yaml#L2
EDIT: The new images are used. They affected the results in the lates run.

[mgencur]

Note to self. Other repositories like Eventing, EKB use the following to generate the dockerfiles:

GO111MODULE=off go get -u github.com/openshift-knative/hack/cmd/generate

$(go env GOPATH)/bin/generate \
  --root-dir "${repo_root_dir}" \
  --generators dockerfile \
  --dockerfile-image-builder-fmt "registry.ci.openshift.org/openshift/release:rhel-8-release-golang-%s-openshift-4.16"

So, the image needs to be updated there and the generate command needs to be re-run via github action "Run Makefile target" on openshift-knative/hack

[skonto]

We might skip 1.12 branch correct?

[mgencur]

We might skip 1.12 branch correct?

What do you mean by that? Do you mea skipping release-v1.12 branch or OCP 4.12 ?

[mgencur]

/retest-required