Docker: avoid mixing glibc with musl libc on Alpine

**What would you like to be added**: Revert #20214. **Why is this needed**: It's a really bad practice to install glibc in Alpine. Mixing C libraries could break a lot of things. The preferred way is to rebuild plugins against musl libc. If this is impossible Alpine provides the (libc6-compat](https://pkgs.alpinelinux.org/package/v3.11/main/x86_64/libc6-compat) package which is available on all architectures (not just x86_64 as the glibc hack) and less risky regarding conflicts. If this doesn't work either, users with special requirements can still fallback to the Debian/Ubuntu variant.