Unable to build the ResNet-50 v1.5 TensorFlow NGC container.

I am trying to follow the directions in /workspace/nvidia-examples/resnet50v1.5/README.md from the NGC container nvcr.io/nvidia/tensorflow:19.07-py3

The instructions state:

2. Build the ResNet-50 v1.5 TensorFlow NGC container.

bash scripts/docker/build.sh

However, when I run this command from inside the Tensorflow NGC container (v19.07). (Example syntax below)

sudo docker run --gpus all --rm -w /workspace/nvidia-examples/resnet50v1.5 nvcr.io/nvidia/tensorflow:19.07-py3 bash scripts/docker/build.sh

it fails with:

scripts/docker/build.sh: line 3: docker: command not found

This is because the docker command is not available from inside the nvcr.io/nvidia/tensorflow:19.07-py3.

I am new to Docker (this is my first experience). How am I suppose to get around this issue? How can I run the resnet50v1.5 build script without it running from inside the tensorflow:19.07-py3 container?

Thank you in advance.