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Only produce .xz tarballs on CI This PR adds a `./configure` option to choose which tarball compression formats to produce, and changes our CI configuration to only produce `.xz` tarballs. The release process will then recompress everything into `.gz` when producing a release. This will drastically reduce our storage costs for CI artifacts, as we'd stop storing the same data twice. **Stable, beta and nightly releases will not be affected by this at all.** Before landing this we'll need to increase the VM size of our release process, to recompress everything in a reasonable amount of time. r? `@Mark-Simulacrum`