Fix Alpine/Linux musl containers that do not already include the C++ runtime libraries required by Bun and the Supabase CLI shim.
- Install missing
libstdc++andlibgccbefore runningoven-sh/setup-bunin Alpine/musl containers. - Keep non-Linux and non-musl runners as no-ops.
- Fail with a clear setup message when a musl container cannot install the required packages.
Validation: https://github.com/jgoux/setup-cli-testing/actions/runs/26172791463