these 2 derivations will be built:
  /nix/store/cvvf6420b5017b3arx04yzf4wf6n4x1z-nixos-test-driver-pg_jsonschema.drv
  /nix/store/d83xx8w1ka2flgipx4laml2zb0vwjihn-vm-test-run-pg_jsonschema.drv