these 2 derivations will be built:
  /nix/store/379z4vraghjil0cmb2rg3gr6s9sljqr9-nixos-test-driver-pg_graphql.drv
  /nix/store/67zlwxaa3957s82cngdrn6kspn9bc06w-vm-test-run-pg_graphql.drv