these 2 derivations will be built:
  /nix/store/l72lanlrdiv2r4w1cla1xv80i5sslvwy-nixos-test-driver-plpgsql_check.drv
  /nix/store/kdi840m91a5zadx2cvyx1vm6s6hhgc01-vm-test-run-plpgsql_check.drv