Added Jellyfin stack

Copied and pasted from current portainer installation.

Jellyfin/docker-compose.yml

@@ -0,0 +1,18 @@
+version: '3.5'
+services:
+  jellyfin:
+    image: jellyfin/jellyfin
+    container_name: jellyfin
+#    user: uid:gid
+    network_mode: 'host'
+    volumes:
+      - /home/nick/docker/jellyfin:/config
+      - /home/nick/docker/jellyfin/cache:/cache
+      - /mnt:/media
+    restart: 'unless-stopped'
+    # Optional - alternative address used for autodiscovery
+    environment:
+      - JELLYFIN_PublishedServerUrl=https://tv.tff.digital.com
+    # Optional - may be necessary for docker healthcheck to pass if running in host network mode
+#    extra_hosts:
+#      - "host.docker.internal:host-gateway"