these 2 derivations will be built:
  /nix/store/dny31al5abajvvq7ra581qvazajdgbnz-nixos-test-driver-pg_partman.drv
  /nix/store/v7d87af9apxk0sqp71wkn71n6gg06csp-vm-test-run-pg_partman.drv