Fix failing docker build

.examples/docker-compose.yml

@@ -0,0 +1,97 @@
+version: '2'
+services:
+  proxy:
+    image: jwilder/nginx-proxy
+    container_name: proxy
+    ports:
+      - 80:80
+      - 443:443
+    volumes:
+      - ./proxy/conf.d:/etc/nginx/conf.d
+      - ./proxy/vhost.d:/etc/nginx/vhost.d
+      - ./proxy/html:/usr/share/nginx/html
+      - ./proxy/certs:/etc/nginx/certs:ro
+      - /var/run/docker.sock:/tmp/docker.sock:ro
+    networks:
+      - proxy-tier
+    restart: always
+
+  letsencrypt-companion:
+    image: alastaircoote/docker-letsencrypt-nginx-proxy-companion
+    container_name: letsencrypt-companion
+    volumes_from:
+      - proxy
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+      - ./proxy/certs:/etc/nginx/certs:rw
+    restart: always
+
+  web:
+    image: nginx
+    container_name: nextcloud_webserver
+    volumes:
+      - ./nginx.conf:/etc/nginx/nginx.conf:ro
+    links:
+      - app
+      - collabora
+    volumes_from:
+      - app
+    environment:
+      - VIRTUAL_HOST=${DOMAIN}
+      - VIRTUAL_NETWORK=nginx-proxy
+      - VIRTUAL_PORT=80
+      - LETSENCRYPT_HOST=${DOMAIN}
+      - LETSENCRYPT_EMAIL=
+    networks:
+      - proxy-tier
+    restart: always
+
+  app:
+    image: nextcloud:fpm
+    container_name: nextcloud_fpm
+    links:
+      - db
+    volumes:
+      - ./nextcloud/apps:/var/www/html/apps
+      - ./nextcloud/config:/var/www/html/config
+      - ./nextcloud/data:/var/www/html/data
+    networks:
+      - proxy-tier
+    restart: always
+
+  db:
+    image: mariadb
+    container_name: db
+    volumes:
+      - ./nextcloud/db:/var/lib/mysql
+    environment:
+      - MYSQL_ROOT_PASSWORD=
+      - MYSQL_DATABASE=nextcloud
+      - MYSQL_USER=nextcloud
+      - MYSQL_PASSWORD=
+    networks:
+      - proxy-tier
+    restart: always
+
+  redis:
+    image: redis
+    container_name: redis
+    networks:
+      - proxy-tier
+    restart: always
+
+  collabora:
+    image: collabora/code
+    container_name: collabora
+    cap_add:
+      - MKNOD
+    environment:
+      - domain=${DOMAIN}
+    networks:
+      - proxy-tier
+    restart: always
+
+networks:
+  proxy-tier:
+    external:
+      name: nginx-proxy