these 2 derivations will be built:
  /nix/store/sahlz6bwc6773s2m5bgfdhp7i1vl746m-nixos-test-driver-plpgsql_check.drv
  /nix/store/nqwj1y262vx4jh4zrpa00xwnm407b2c0-vm-test-run-plpgsql_check.drv