ci: build code again on main to pre-fill the rosetta cache #34834
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Reason for this change
Restrictions for accessing a cache effectively limit a PR to use the rosetta cache either from the same branch or the main branch. Because we currently don't fill the rosetta cache on main, most PRs cannot use this cache.
Using the cache removes ~14min of most builds. This is a worthwhile investment.
Description of changes
Run the PR build against
mainandv2-releaseto always fill up the rosetta cache. We could probably set this up to skip tests, but for now this is easier.Also adds manual (always helpful) and merge group trigger (future proofing) to the build.
Describe any new or updated permissions being added
n/a
Description of how you validated changes
Reading the GitHub docs. Needs merging to actually validate.
Checklist
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license