publish release source archive

Merge pull request #899 from nullclaw/feat/publish-nightly-release

ci: publish nightly prerelease

fix release docker zig 0.16 install

fix(daemon): use mutex for draft ID counter on 32-bit targets

std.atomic.Value(u64) is unsupported on 32-bit ARM (Android armv7).
Replace with mutex-protected plain u64.