these 2 derivations will be built:
  /nix/store/jp12lf1prp2p3c6w9mwm9y21q0x0zjpl-postgres-15-check-harness.drv
  /nix/store/7anypbw8p6gxhlh36rzi53hxynd08lba-run-check-harness-psql-15.drv