feat: add docker-compose.yml for container with external SSL certificate

It won't generate a new self signed SSL certificate but it will use the provided one.

Signed-off-by: Egidio Caprino <egidio.caprino@gmail.com>

.examples/docker-compose/with-nginx-proxy-external-ssl/mariadb/fpm/docker-compose.yml

@@ -0,0 +1,61 @@
+version: '3'
+
+services:
+  db:
+    image: mariadb
+    command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
+    restart: always
+    volumes:
+      - db:/var/lib/mysql
+    environment:
+      - MYSQL_ROOT_PASSWORD=
+    env_file:
+      - db.env
+
+  app:
+    image: nextcloud:fpm-alpine
+    restart: always
+    volumes:
+      - nextcloud:/var/www/html
+    environment:
+      - MYSQL_HOST=db
+    env_file:
+      - db.env
+    depends_on:
+      - db
+
+  web:
+    build: ./web
+    restart: always
+    volumes:
+      - nextcloud:/var/www/html:ro
+    environment:
+      - VIRTUAL_HOST=
+    depends_on:
+      - app
+    networks:
+      - proxy-tier
+      - default
+
+  proxy:
+    build: ./proxy
+    restart: always
+    ports:
+      - 80:80
+      - 443:443
+    volumes:
+      - ${CERT_PATH}:/etc/nginx/certs:ro
+      - vhost.d:/etc/nginx/vhost.d
+      - html:/usr/share/nginx/html
+      - /var/run/docker.sock:/tmp/docker.sock:ro
+    networks:
+      - proxy-tier
+
+volumes:
+  db:
+  nextcloud:
+  vhost.d:
+  html:
+
+networks:
+  proxy-tier: