this derivation will be built:
  /nix/store/xchr7zp13l7bggrabdir4k17xmf1d2yk-mkEffect-root.drv
building '/nix/store/iif00d3wldgyrd2zlqs0cpjvbvr973nk-gc-env.drv'...
Running phase: initPhase
@nix { "action": "setPhase", "phase": "initPhase" }
Running phase: userSetupPhase
@nix { "action": "setPhase", "phase": "userSetupPhase" }
Running phase: effectPhase
@nix { "action": "setPhase", "phase": "effectPhase" }
event: push actor= pr=
gc: step 1/1