GPU support in container

Try this:

 plex:
    image: ghcr.io/linuxserver/plex
    container_name: plex
    network_mode: host
    runtime: nvidia
    environment:
      - PUID=1000
      - PGID=1000
      - VERSION=docker
      - UMASK_SET=022 #optional
      - PLEX_CLAIM= #optional
      - NVIDIA_VISIBLE_DEVICES=all
    volumes:
      - /var/lib/plexmediaserver:/config
      - /media:/media
      - /transcoder:/transcoder
      - /etc/resolv.conf:/etc/resolv.conf
    restart: unless-stopped