these 2 derivations will be built:
  /nix/store/javdx2d2cphprpqvb33v8ax41fq47qr6-postgres-15-check-harness.drv
  /nix/store/5xcpr4xyjg7dvprj5v3irivs1pqb3h5w-run-check-harness-psql-15.drv