these 2 derivations will be built:
  /nix/store/6flzg41z4bv3zj745ljsyhq54lflww7v-nixos-test-driver-pg_graphql.drv
  /nix/store/x0ghwrbyixxw4ag5kjh94bwynppp8z0n-vm-test-run-pg_graphql.drv