feat(scaling): add support for loadbalancing

defaults/main.yml

@@ -2,8 +2,11 @@
 collabora_domain: collabora.example.url
 collabora_image: tiredofit/collabora-online
 collabora_version: 2.4.19
+collabora_nginx_image: nginxproxy/nginx-proxy
+collabora_nginx_version: 1.3.1-alpine
 collabora_container_hostname: collabora
 collabora_allowed_hosts: "host2.example.url"
+collabora_scale: 1
 collabora_port: 9980
 collabora_admin: testuser
 collabora_secret: test123

templates/docker-compose.yml.j2

@@ -4,18 +4,28 @@
 version: "3.4" 
 
 services:
+  loadbalancer:
+    image: "{{ collabora_nginx_image }}:{{ collabora_nginx_version }}"
+    ports:
+      - "127.0.0.1:{{ collabora_port }}:80"
+    volumes:
+      - /var/run/docker.sock:/tmp/docker.sock:ro
   collabora:
     image: "{{ collabora_image }}:{{ collabora_version }}"
     container_name: {{ collabora_container_hostname }}
     hostname: {{ collabora_domain }}
     restart: unless-stopped
+    scale: {{ collabora_scale }}
     cap_add:
       - MKNOD
       - NET_ADMIN
     privileged: true
-    ports: 
-      - "127.0.0.1:{{ collabora_port }}:9980"
+    expose: 
+      - "9980"
     volumes:
       - ./logs:/logs
     env_file:
       - ./.env
+    environment:
+      - VIRTUAL_HOST={{ collabora_domain }}
+      - USE_IP_HASH=1