these 3 derivations will be built:
  /nix/store/l1nngn9zdym7d5flz0wxiv51hfi21sf0-start-postgres-server-test.drv
  /nix/store/vzg8w9ilxb1bjvxbhi6z39vav3ilpjxv-postgres-15-check-harness.drv
  /nix/store/4gb0rym93b1635n4gq8iyyrxac53cild-run-check-harness-psql-15.drv