Revert Alpine Linux change

Author: alessfg

tasks/opensource/install-alpine.yml

@@ -8,7 +8,8 @@
 
 - name: (Alpine Linux) Install NGINX
   apk:
-    name: "nginx{{ nginx_repository is not defined | ternary('@nginx', '') }}{{ nginx_version | default('') }}"
+    name: "nginx{{ nginx_version | default('') }}"
+    repository: "{{ nginx_repository | default(nginx_default_repository_alpine) }}"
     state: "{{ nginx_state }}"
     update_cache: true
   ignore_errors: "{{ ansible_check_mode }}"