fix: install Alpine runtime dependencies

[jgoux]

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