fix: install Alpine runtime dependencies (#433)

## Summary
- Install missing Alpine runtime libraries before setting up Bun on
Linux musl containers
- Keep non-musl and non-Linux runners as no-ops
- Fail with a clear message if a musl container cannot install the
required packages

## Testing
- `bun test`
- `bun run format:check && bun run lint && bun run typecheck`
- Verified `supabase_2.100.0_linux_arm64.apk` fails on plain Alpine
without `libstdc++`/`libgcc` and reports `2.100.0` after installing them