these 3 derivations will be built:
  /nix/store/whar3n16dl11s4kd69xzpym4jqaa6a9y-start-postgres-server-test.drv
  /nix/store/z7j235sjs2mrf5qmvgjn4inrzam9wb0y-postgres-15-check-harness.drv
  /nix/store/hz5dzhq8xjf9d67jh3h42lf39mcas4if-run-check-harness-psql-15-slim.drv