Whitespace in Dockerfile causes runtime errors

Hi there,

I'm working on recreating this on my own sagemaker instance and ran into an issue:
` Error response from daemon: dockerfile parse error line 9: unknown instruction: CMAKE`

After a quick search of the issue, I found that the [extra whitespace on the lines of the docker file](https://github.com/aws/amazon-sagemaker-examples/blob/d004f43f2abe2034fb8c79a6af0e51e46da7c501/inference/generativeai/llm-workshop/lab4-openchatkit/deploy_openchatkit_on_sagemaker.ipynb#L984C27-L984C27) were the cause of the issue. I'd like to kindly suggest either adding a notice of this potential error or removing the whitespace all together.

Thanks for putting this tutorial together!

Best regards,
Ahir Chatterjee