feat: add vscode to base image

[rokroskar]

Adds VSCode using code-server and jupyter-vscode-proxy.

For testing, you can use this image: renku/renkulab-py:3.7-c43683d add these lines to your Dockerfile:

USER root
RUN curl -s https://raw.githubusercontent.com/SwissDataScienceCenter/renkulab-docker/c50af197ccd7b727b9baa0aebf60602c669ab546/scripts/install-vscode.sh | bash
USER ${NB_USER}

closes #83

[olevski]

@rokroskar I tested the image you mentioned. I did not go over all vs code features. But I did try launching vscode, making a new file and commiting and pushing it. That works. Also I tested out the terminal and running things - that was also fine.

I have only one comment though - should be easy to resolve.

[rokroskar]

@ciyer @olevski I removed the vscode install from the base Dockerfile and moved the steps to scripts/install-vscode.sh. I invoke it with these lines, and would add this to our base template but commented out:

USER root
RUN curl -s https://raw.githubusercontent.com/SwissDataScienceCenter/renkulab-docker/c50af197ccd7b727b9baa0aebf60602c669ab546/scripts/install-vscode.sh | bash
USER ${NB_USER}

Of course the exact version of the file in the raw github link will be different, but this one works while this PR is open. See https://dev.renku.ch/projects/rokroskar/test-vscode/files/blob/Dockerfile

[olevski]

One minor comment. Everything else is fine. I tested the image created by adding the command you posted in the project's dockerfile. It works.