these 2 derivations will be built:
  /nix/store/rvskaxv0v6j7xy94m9ghbx2flq6wmwbs-nixos-test-driver-pg_jsonschema.drv
  /nix/store/bczqv64ixz24ljwh3sij1s0qkz22vkvv-vm-test-run-pg_jsonschema.drv