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Jon Ross-Perkins
e45ab50e5b
We keep seeing fragility installing software, with both brew (e.g., the recent python issues) and apt.llvm.org (currently flaky). At this point, images for both ubuntu and macos have versions of llvm-14 that seem to successfully compile: https://github.com/carbon-language/carbon-lang/actions/runs/3474670746/jobs/5808098087 Although we may want to figure out a way to resume running llvm-15 so that we can see compatibility issues, this seems preferable for baseline testing in order to reduce maintenance churn. In addition to the above changes, this also configures cancellation more precisely, and stops installing bazel/bazelisk (it should already be preinstalled).