build: reenable building arm64 concurrently #30626
Merged
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This is kind of an experiment. Originally we used travis arm64 to build, and had to reduce build concurrency due to limited memory. Nowadays we don't cross build, only to docker, and on that we use amd64 builders. This PR is an attempt to speed up the docker image builders so it doesn't take 45 minutes.
Then again, it could happen that the CI env var isn't passed to docker at all. Oh well, I don't really see a reason to constrain ourselves. We can revert if something downstream borks.