How can I keep Python packages persistent in a Docker container without rebuilding the image?

If you want to manage persisting Python packages without rebuilding, one option is to use a pip flag that downloads packages without immediately installing them. You can then store those packages in a directory on your Docker host that you mount into your container. Use a startup script that executes pip install to install those packages every time the container starts. A quick search should help you find those pip flags you need.

You could also create your own Docker container based on the original one. Use the Dockerfile syntax like 'FROM original-image', and then use 'ADD' and 'RUN' commands to set it up with the necessary components. This way, you could include whatever packages you need without rebuilding the entire base image.

Another approach is to create a startup script that copies your Python modules to the appropriate location in the container. This could help resolve permission issues too, just remember you'll need to restart your container to run the script. However, be cautious, as this method might not be ideal for every setup.

It sounds like you're looking to install Python packages at runtime, but you might want to reconsider that approach. Containers are typically designed to be ephemeral, so the best practice is to build your image with everything included and run it as-is. If there's a need for changes, you should build a new image instead of trying to change it during runtime. It might save you some hassle in the long run.