PR #580 made nightlies publish to a single rolling `nightly` release and set
`release_tag` to `nightly` for downloads. A pinned or stale install then resolved
to `nightly` and fetched whatever binary HEAD currently pointed at — an ABI
mismatch against its own Lua/FFI layer.
Restore per-sha download: `release_tag` is the unique `version` again, so each
commit's binaries live in their own permanent release. CI still force-moves the
`nightly` tag to HEAD for "give me latest" tooling, gated on `is_release` instead
of the now-per-sha `release_tag`. `current_release_tag` prefers the per-sha tag
over the `nightly` alias when both point at HEAD.
Co-authored-by: Dmitriy Kovalenko <dmtr.kovalenko@outlook.com>
Gustav the Bot
0acbd18dce