ci: split build-image into separate workflow #107
Merged
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The current setup doesn't work with pull requests, even if no changes were made to the CI Dockerfile.
So instead, split the build-image job into a separate workflow that is only triggered manually. If someone submits a PR that updates the CI image, a maintainer with admin/write access must cherry-pick those commits into a branch, push that to the origin repo, and run this workflow on that branch.
I think there's a better way to do this with pull_request_target, but I need to wrap my brain around the security implications first.