Agnostic cloud gpu docker image and Jupyter lab

[winglian]

This PR:

• renames the axolotl-runpod image name to axolotl-cloud to be more agnostic. We will continue in the short term to also push the same image to axolotl-runpod
• adds support for Jupyter Lab to start automatically in the cloud image. It looks for the JUPYTER_PASSWORD env var that runpod automatically sets on all containers and uses that as the default token.

[NanoCode012]

  build-axolotl-runpod: # to cloud
    needs: build-axolotl
    if: github.repository_owner == 'OpenAccess-AI-Collective'

Does this name need to be updated also?

[winglian]

Nah. That's for the Github action to run.