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/webserver/tasks/main.yaml

@@ -0,0 +1,28 @@
+---
+# Tasks for Nextcloud webserver role
+- name: Copy dockerfile
+  synchronize: src=web dest=/tmp
+
+- name: Build nginx webserver image
+  docker_image:
+    name: "{{ web_container_image }}"
+    build:
+      path: /tmp/web/
+      dockerfile: /tmp/web/Dockerfile
+      pull: yes
+    state: present
+    source: build
+    force_source: yes
+
+- name: Create webserver container
+  docker_container:
+    name: "{{ web_container_name }}"
+    image: "{{ web_container_image }}"
+    state: started
+    restart_policy: "unless-stopped"
+    links:
+      - "{{ container_name }}:app"
+    published_ports:
+      - "127.0.0.1:9080:80"
+    volumes:
+      - "/var/lib/{{ host_directory }}:/var/www/html:ro"