Flutter Beta - Docker mod for code-server

This mod adds a Flutter beta dev environment to code-server, to be installed/updated during container start. The enviornment is already configured to run browser apps.

flutter create myapp
cd myapp
flutter run --web-port=8989 

Open a browser pointing to:

https://my-code-server-host/proxy/8989

When edit the code, press r and refresh the web page, or install the Flutter extension for code-server.

In code-server docker arguments, set an environment variable DOCKER_MODS=linuxserver/mods:code-server-flutter

If adding multiple mods, enter them in an array separated by |, such as DOCKER_MODS=linuxserver/mods:code-server-flutter|linuxserver/mods:code-server-mod2