Webserver host vars added

roles/webserver/tasks/install_nginx.yml

@@ -1,4 +1,4 @@
 - name: webserver | nginx | installing nginx
   package:
-    name: nginx
+    name: "{{ nginx_package }}"
     state: latest

roles/webserver/vars/Ubuntu.yml

@@ -0,0 +1,3 @@
+apache_package: apache2
+nginx_package: nginx
+acme_package: acme