these 2 derivations will be built:
  /nix/store/qwcn5hpb5w83pzznlj0c6g2kqyv7iqx2-nixos-test-driver-pgtap.drv
  /nix/store/x4l163l94bd3sar9520ndr1y3p4dy52h-vm-test-run-pgtap.drv