these 3 derivations will be built:
  /nix/store/2xfnm0hrnmmhwsspp3hnirnw56nk2fa8-start-postgres-server-test.drv
  /nix/store/mailcj59dv1240y2w851p9xcixjzjh2n-postgres-15-check-harness.drv
  /nix/store/nj4zsdp2dhz9k8jl5jn67lvwkdixh5fl-run-check-harness-psql-15.drv