these 3 derivations will be built:
  /nix/store/idfyb9gf22qm78n5zly2aycmbyqpl593-start-postgres-server-test.drv
  /nix/store/l2ynx6jvx523621hq47mhmrkakh2bcy4-postgres-15-check-harness.drv
  /nix/store/2kq6ywqwhknj2wg38iqwaz2dk8shwmby-run-check-harness-psql-15-slim.drv