Usually you should not really do that, containers are supposed to be immutable, meaning that you just deploy them and do not make the changes to the container but instead make the changes locally, build a new image with the new changes and then deploy the image.

Another thing that you could do is have a Docker volume and a mount and store your files in that mount, that way you would be making the changes and they would be saved in the volume rather than just on the Docker container storage layer.

This is also good because if your container gets deleted your files would be stored in the volume and can be reused.

I need to attach to Docker container running in a droplet too. In my case, I need to debug issue that only occurs in PROD.

Any suggestions would be appreciated.

Thanks