these 2 derivations will be built:
  /nix/store/nszb1nx37hq8i1iajnjrb9693z3fvp09-nixos-test-driver-pg_jsonschema.drv
  /nix/store/b9gdpd80zj06vdcy909vpgxspfcdra0l-vm-test-run-pg_jsonschema.drv