[release-1.2] Build and push multi-arch/os (amazon and windows, no debian) image manifest via Make rules #1062
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Is this a bug fix or adding new feature?
What is this PR about? / Why do we need it? cherry-pick of #957 on to release-1.2 branch
The main motivation is to mitigate the slow builds in this branch #1048 . Building amazonlinux + windows manifest using this Makefile is faster than building amazonlinux + debian manifest using the old Makefile I suspect because the old one wastes a lot of time doing multi-platform binary builds while virtualizing the platforms whereas this one leverages --platform=$BUILDPLATFORM and GOOS to multi-platform binaries on x86.
What testing is done? I will check after this merges if the release-1.2 branch prow build finishes within an hour or not.