v0.10.40.

The first published build of the 0.10.38 changes — read the 0.10.38 section below, including its upgrade notes. Neither the 0.10.38 nor the 0.10.39 tag reached a panel: the smoke-gated release pipeline (r581) stopped each one before any image was pushed, :latest moved or a GitHub Release was created.

Fixed

• Railpack on arm64 (r584). Railpack names its arm64 Linux binary arm64-unknown-linux-musl, not aarch64-… (Nixpacks' spelling). The arm64 image build 404'd, and install.sh on arm64 bare-metal hosts has silently never installed railpack since it was introduced. Both archives re-verified against Railpack's published checksums.