Use pip install with --no-cache-dir in the Dockerfile

[PeterDaveHello]

This will help minimize the Docker image size a bit.

Summary from GitHub Copilot, just for your reference:

This pull request includes a small change to the Dockerfile. The change modifies the RUN pip install command to use the --no-cache-dir option, which prevents pip from caching the packages it installs. This helps to reduce the size of the Docker image.

• Dockerfile: Modified the RUN pip install command to use the --no-cache-dir option for installing packages.