move mastodon files to nfs

ansible/roles/mastodon/docker-stack.yml.j2

@@ -8,6 +8,11 @@ networks:
 
 volumes:
   cache:
+  system:
+    driver_opts:
+      type: "nfs"
+      o: "addr=192.168.30.10,nolock,soft,rw"
+      device: ":/mnt/data/mastodon/system"
 
 services:
   db:
@@ -73,9 +78,11 @@ services:
       - db
       - redis
     volumes:
-      - type: bind
-        source: /mnt/data/mastodon/public/system
+      - type: volume
+        source: system
         target: /mastodon/public/system
+        volume:
+          nocopy: true
       - cache:/mastodon/public/system/cache
     deploy:
       placement:
@@ -134,9 +141,11 @@ services:
     networks:
       - mastodon
     volumes:
-      - type: bind
-        source: /mnt/data/mastodon/public/system
+      - type: volume
+        source: system
         target: /mastodon/public/system
+        volume:
+          nocopy: true
       - cache:/mastodon/public/system/cache
     healthcheck:
       test: ['CMD-SHELL', "ps aux | grep '[s]idekiq\ 6' || false"]