v2.2.2: Unblock ARM64 PGO release builds

A tiny release-plumbing patch. The v2.2.1 ARM64 Linux PGO build failed because HOME=/tmp/aube-home was backed only by nested Docker mounts, leaving the home directory itself root-owned and unwritable, so mise couldn't create its state directory. This release fixes the workflow so those builds can publish. There are no user-facing changes to aube itself.

Fixed

• Mount a writable home for ARM64 PGO builds (#1409 by @jdx) — The ARM64 PGO release container now bind-mounts a runner-owned writable home at /tmp/aube-home (with the Cargo registry and git caches nested inside), so the non-root container user can write mise state and Cargo metadata during the build.

Full Changelog: v2.2.1...v2.2.2

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