these 2 derivations will be built:
  /nix/store/6fp4swrcw1srykzk4yh34rsl8xiq48ql-nixos-test-driver-plpgsql_check.drv
  /nix/store/ipmj0qms6fq827ai1i7jcq6yd56w3lab-vm-test-run-plpgsql_check.drv