this derivation will be built:
  /nix/store/hslrjqqsqmkn8w9b8z3rkr9i4fjd8bjj-pg_isolation_regress-15.19.drv
building '/nix/store/hslrjqqsqmkn8w9b8z3rkr9i4fjd8bjj-pg_isolation_regress-15.19.drv'
pg_isolation_regress-15.19> Running phase: installPhase