[gitlab] set /etc/gitlab/ssl mode to '0755'

(cherry picked from commit 0a18b9a)

ansible/roles/gitlab/tasks/main.yml

@@ -52,7 +52,7 @@
     state: 'directory'
     mode: '{{ item.mode }}'
   loop:
-    - { path: '/etc/gitlab/ssl',           mode: '0775' }
+    - { path: '/etc/gitlab/ssl',           mode: '0755' }
     - { path: '/etc/gitlab/trusted-certs', mode: '0755' }
 
 - name: Manage CA certificate symlinks in GitLab environment