Add static build for Ubuntu 21.04 to CI

I need some advice on this.

As you can see, the new job builds fine but fails during install because it tries to install non-existent shared object libraries. It fails and stops at the Ruby language bindings but I suspect it would fail on the others as well if it continued.

I don't know anything about the language bindings. Should I try to install the static libraries instead or just avoid installing the shared ones?