Extension Arguments - Docker mod for code-server

This mod installs code-server extensions at startup. The list of extensions to be installed should be provided using environment variable VSCODE_EXTENSION_IDS separated by |.

For example, to install the vscode-docker and vscode-icons extensions add the following lines to your docker compose service:

- DOCKER_MODS=linuxserver/mods:code-server-docker|linuxserver/mods:code-server-extension-arguments
- VSCODE_EXTENSION_IDS=vscode-icons-team.vscode-icons|ms-azuretools.vscode-docker