Upgrade CI to build on macOS 12 #21413
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This was referenced Sep 16, 2024
huonw
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Sep 16, 2024
This unblocks doing 2.24 dev releases while we get ourselves sorted and upgrade OSes on CI. Our current 2.23 builds are issuing the following warning, which becomes an error for 2.24-versioned builds (like #21412): ``` 14:44:14.41 [WARN] DEPRECATED: using Pants on macOS 10.15 - 11 is scheduled to be removed in version 2.24.0.dev0. Future versions of Pants will only run on macOS 12 and newer, but this machine appears older (macOS-10.15.7-x86_64-i386-64bit). You can temporarily silence this warning with the `[GLOBAL].allow_deprecated_macos_before_12` option. If you have questions or concerns about this, please reach out to us at https://www.pantsbuild.org/community/getting-help. ``` The underlying deprecation is that Pants 2.24..0.dev0 and newer will no longer support running of Pants on macOS < 12, and that includes our own in-repo builds. However, it's strictly more permissive to build on macOS 10.15 or 11, so we're "allowed" to do that even though it's after the deprecation time. Upgrading the runners properly is covered by #21413. The x86-64 change is in #21417.
huonw
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Sep 23, 2024
This removes our use of the self-hosted 10.15 x86-64 runner in favour of a GitHub-hosted macOS 12 runner, implicitly changing our macOS version support in the process. Note: these macOS 12 runners are disappearing in #21333, so I think 2.24 will have to be the last release supporting macOS 12 "properly", and hopefully we'll have finished that release series before GitHub gets rid of them. An alternative that doesn't limit us to GitHub's timelines would be upgrading OS on the self-hosted runner. I'm disinclined from the alternative. Landing this PR as-is theoretically allows us to turn off the self-hosted runner and save money. Half of #21413
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Can we close this as done? Either way, we're going to need to make further changes due to this email: 
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Is your feature request related to a problem? Please describe.
In #21074 / #21326, we deprecated running on macOS 11 and earlier, in favour of macOS 12. We should upgrade our CI to match this:
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