Nextcloud broken into roles.

Updated the web nginx.conf and the source is not given in the readme.
Restricted to gondor.
Webserver image and container names are now picked from the vars file.

nextcloud/roles/nextcloud/tasks/main.yaml

@@ -0,0 +1,39 @@
+---
+# Tasks for Nextcloud role
+- name: Pull Nextcloud image
+  docker_image:
+    name: "{{ container_image }}"
+    source: pull
+    force_source: yes
+
+- name: Ensure Nextcloud Directory exists
+  file:
+      path: "/var/lib/{{ host_directory }}"
+      state: directory
+      mode: 0755
+
+- name: Create Nextcloud container
+  docker_container:
+    name: "{{ container_name }}"
+    image: "{{ container_image }}"
+    state: started
+    restart_policy: "unless-stopped"
+    env:
+      POSTGRES_DB: "{{ db_name }}"
+      POSTGRES_USER: "{{ db_user }}"
+      POSTGRES_PASSWORD: "{{ db_pass }}"
+      POSTGRES_HOST: "{{ db_host }}"
+      REDIS_HOST: "redis"
+    links:
+      - "postgres:db"
+      - "redis:redis"
+    published_ports:
+      - "127.0.0.1:9000:9000"
+    volumes:
+      - "/var/lib/{{ host_directory }}:/var/www/html"
+
+- name: Add cron job
+  cron:
+    name: Nextcloud cron
+    minute: "*/5"
+    job: "docker exec -u www-data {{ container_name }} php cron.php"