these 2 derivations will be built:
  /nix/store/4kmvjln1nzyh566havj4f9pmycdihpfw-nixos-test-driver-pg_jsonschema.drv
  /nix/store/d9h6yv3q4abqxvm2y3413p7q7b1jzgik-vm-test-run-pg_jsonschema.drv