Documentation: Docker startup options GitHub Codespaces

[jhhhnikt]

Underneath the Docker startup options you might want to add a section about running ShinyProxy in GitHub Codespaces.

The key things to make ShinyProxy to work in GitHub Codespaces are to add docker-in-docker (or docker-outside-of-docker but I have not tested this) and use socat to allow for connections on port 2375.

The following illustrates the steps to make ShinyProxy run in GitHub Codespaces.

1. Add the docker-in-docker feature in devcontainer.json.
2. Rebuild container.
3. Run sudo apt-get update && sudo apt-get install -y socat.
4. Run socat -d -v -d TCP-L:2375,fork UNIX:/var/run/docker.sock. Thanks https://blog.mikesir87.io/2018/10/using-socat-to-see-docker-socket-traffic/
5. Open a new terminal i VSCode.
6. wget -P "$HOME" https://www.shinyproxy.io/downloads/shinyproxy-3.0.2.jar
7. java -jar -Dserver.forward-headers-strategy=native "$HOME/shinyproxy-3.0.2.jar"

Hopefully this might be useful for someone, it took a bit trial and error to figure it out.