these 2 derivations will be built:
  /nix/store/bnhl6rkk93l4wcq9n9nd2ga425nwrfsh-nixos-test-driver-pg_jsonschema.drv
  /nix/store/nm2kmjlf58zpz1xbzlpn3z195k5894xb-vm-test-run-pg_jsonschema.drv