[release-1.21] fix: host builder can push to OCP internal registry - #3887
[release-1.21] fix: host builder can push to OCP internal registry#3887knative-prow-robot wants to merge 1 commit into
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OpenShift's internal registry returns HTTP 500 for manifest HEAD requests by digest when the repository doesn't exist yet. Since remote.WriteIndex checks child manifests by digest, the push fails on a fresh repository. Before writing the index, perform a HEAD request by tag. If the registry returns 404, push an empty image to create the repository first. The empty image tag is then overwritten by the index push. Signed-off-by: Matej Vašek <matejvasek@gmail.com>
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This is an automated cherry-pick of #3885