message: More Makefile fixes.
diff: gpu-image:
  mkdir -p staging
  cp ../*.py staging/
  - cp ../requirements-gpu.txt staging/
  + cp ../requirements.txt staging/
  cp player_wrapper.sh staging/
  docker build -f Dockerfile.gpu -t "gcr.io/$(PROJECT)/$(GPU_PLAYER_CONTAINER):$(VERSION_TAG)" .
  rm staging/*.py
  - rm staging/requirements-gpu.txt
  + rm staging/requirements.txt
  rm staging/player_wrapper.sh
  cpu-image:
  