v2.2.9: Restore the ARM64 release build

A small release that fixes aube's ARM64 release build so the aarch64-unknown-linux-gnu artifact ships again.

Fixed

• Create the ARM64 target directory before Docker mounts it (#1478 by @jdx) — Docker creates a missing bind-mount source as root, but the ARM64 release job runs its container as the runner user, so benchmarks/pgo.bash couldn't write target/pgo-data and the PGO build failed. The workspace target directory is now created up front as the runner user (with a writability check before PGO starts), restoring the ARM64 release artifact.

Full Changelog: v2.2.8...v2.2.9

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