This mod adds zsh to code-server, to be installed/updated during container start.
In code-server docker arguments, set an environment variable DOCKER_MODS=linuxserver/mods:code-server-zsh
If adding multiple mods, enter them in an array separated by |, such as DOCKER_MODS=linuxserver/mods:code-server-zsh|linuxserver/mods:code-server-prolog