message: Add support in build script for parameterized ROOT_CONTAINER
diff: @@ -43,6 +43,7 @@ function die()
  # Set up WORKSPACE.
  WORKSPACE="${WORKSPACE:-$(upsearch WORKSPACE)}"
  +ROOT_CONTAINER=${ROOT_CONTAINER:-tensorflow/tensorflow}
  TF_ROOT_CONTAINER_TAG=${ROOT_CONTAINER_TAG:-devel}
  TF_BUILD_VERSION=${TF_DOCKER_BUILD_DEVEL_BRANCH:-master}
  TF_REPO=${TF_REPO:-https://github.com/tensorflow/tensorflow}
  @@ -222,6 +223,7 @@ do
  do
  # Clear the build args array
  TF_DOCKER_BUILD_ARGS=("--build-arg TARGET_PLATFORM=${PLATFORM}")
  + TF_DOCKER_BUILD_ARGS+=("--build-arg ROOT_CONTAINER=${ROOT_CONTAINER}")
  FINAL_TAG="${TF_DOCKER_BUILD_VERSION}"
  ROOT_CONTAINER_TAG="${TF_ROOT_CONTAINER_TAG}"
  