[libcxx-commits] [libcxx] Rehome libcxx-builder docker image & attempt gentler termination. (PR #71604)

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EricWF wrote:

I'm going to go ahead and merge this, and we'll move it to LLVM once the permission issues are cleared up. Merging this unblocks me on other work.

https://github.com/llvm/llvm-project/pull/71604