Fix challenge-cli not setting storage when using --volume and friends. Improve error messages. Fix multiple issues with Dockerfile.gpu. Change make docker-run and make docker-run-gpu to use docker flags that match the Dyff cloud environment by default.

Add test command for read-only filesystem

Add instructions for testing that container works without internet access.

Add GPU Dockerfile and requirements

Default to CPU-only version of torch. Improve docs.

Fix docker image not working in kubernetes. Fix int width not set in input scherma. Add makefile and test image.