MediaDC - Docker mod for nextcloud

This mod adds the required and optional packages the MediaDC nextcloud app needs to work. Optional dependency Scipy is only installed on x86_64 as there are no wheels available for arm64v8.

In nextcloud docker arguments, set an environment variable DOCKER_MODS=linuxserver/mods:nextcloud-mediadc

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