these 2 derivations will be built:
  /nix/store/wr998kzyjybqwc1w28ccbn2m51diz8rl-nixos-test-driver-plpgsql_check.drv
  /nix/store/0yvlapqijkk0ahdxbk8pc2xnzqv3vj8i-vm-test-run-plpgsql_check.drv