Only add repository key when nginx_repository is used.

Fix #68

Author: gusttt

tasks/main.yml

@@ -2,10 +2,14 @@
 - import_tasks: prerequisites/install-prerequisites.yml
 
 - import_tasks: keys/apt-key.yml
-  when: ansible_os_family == "Debian"
+  when:
+    - ansible_os_family == "Debian"
+    - nginx_install_from == "nginx_repository"
 
 - import_tasks: keys/rpm-key.yml
-  when: ansible_os_family == "RedHat" or ansible_os_family == "Suse"
+  when:
+    - ansible_os_family == "RedHat" or ansible_os_family == "Suse"
+    - nginx_install_from == "nginx_repository"
 
 - name: "(Install: Debian/Ubuntu/CentOS/RedHat/FreeBSD) Install NGINX"
   block: