change mastodon cache location to prevent disk full

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

@@ -17,7 +17,9 @@ services:
   db:
     image: postgres:14-alpine
     networks:
-      - mastodon
+      mastodon:
+        aliases:
+          - db
     healthcheck:
       test: ['CMD', 'pg_isready', '-U', 'postgres']
     volumes:
@@ -36,7 +38,9 @@ services:
   redis:
     image: redis:7-alpine
     networks:
-      - mastodon
+      mastodon:
+        aliases:
+          - redis
     healthcheck:
       test: ['CMD', 'redis-cli', 'ping']
     volumes:
@@ -83,7 +87,7 @@ services:
         volume:
           nocopy: true
       - type: bind
-        source: /media/mastodon_cache
+        source: /mnt/data/mastodon/cache
         target: /mastodon/public/system/cache
     deploy:
       placement:
@@ -154,7 +158,7 @@ services:
         volume:
           nocopy: true
       - type: bind
-        source: /media/mastodon_cache
+        source: /mnt/data/mastodon/cache
         target: /mastodon/public/system/cache
     healthcheck:
       test: ['CMD-SHELL', "ps aux | grep '[s]idekiq\ 6' || false"]