add docker-compose swarm example

compose/docker-compose-swarm.yml

@@ -0,0 +1,90 @@
+version: '3.8'
+services:   
+  seafile-server:
+    image: ggogel/seafile-server:8.0.2
+    volumes:
+      - seafile-data:/shared 
+    environment:
+      - DB_HOST=db
+      - DB_ROOT_PASSWD=db_dev
+      - TIME_ZONE=Europe/Berlin
+      - SEAFILE_ADMIN_EMAIL=me@example.com
+      - SEAFILE_ADMIN_PASSWORD=asecret
+      - HTTPS=false # Set this to true if you plan to use a reverse proxy with HTTPS. Can be changed later in the admin settings on the web-ui.
+      - SEAFILE_SERVER_HOSTNAME=seafile.mydomain.com # Mandatory on first deployment!
+    depends_on:
+      - db
+      - memcached
+    networks:
+      - seafile-net
+
+  seahub:
+    image: ggogel/seahub:8.0.2
+    volumes:
+      - seafile-data:/shared
+      - seahub-avatars:/shared/seafile/seahub-data/avatars
+      - seahub-custom:/shared/seafile/seahub-data/custom 
+    depends_on:
+      - seafile
+    networks:
+      - seafile-net
+    deploy:
+      replicas: 1
+
+  seahub-media:
+    image: ggogel/seahub-media
+    volumes:
+     - seahub-avatars:/usr/share/caddy/media/avatars
+     - seahub-custom:/usr/share/caddy/media/custom
+    networks:
+      - seafile-net
+    deploy:
+      replicas: 1
+
+  db:
+    image: mariadb:latest
+    environment:
+      - MYSQL_ROOT_PASSWORD=db_dev
+      - MYSQL_LOG_CONSOLE=true
+    volumes:
+      - seafile-mariadb:/var/lib/mysql
+    networks:
+      - seafile-net
+
+  memcached:
+    image: memcached:latest
+    entrypoint: memcached -m 1024
+    networks:
+      - seafile-net
+
+  seafile-caddy:
+    image: ggogel/seafile-caddy:swarm
+    networks:
+      - seafile-net
+      - caddy
+    deploy:
+      endpoint_mode: dnsrr # this enables caddy to see all IPs of service's replicas
+      labels:
+        caddy: http://seafile.gogel.me
+        caddy.reverse_proxy: "{{upstreams 80}}"
+
+networks:
+  seafile-net:
+    internal: true
+  caddy:
+    external: true
+
+volumes:
+  seafile-data:
+    driver: glusterfs
+    name: "seafile-data"
+  seafile-mariadb:
+    driver: glusterfs
+    name: "seafile-mariadb"
+  seahub-avatars:
+    driver: glusterfs
+    name: "seafile-data/seafile/seahub-data/avatars"
+  seahub-custom:
+    driver: glusterfs
+    name: "seafile-data/seafile/seahub-data/custom"
+