change sshkey input from file to encrypted variable

tasks/main.yml

@@ -16,11 +16,13 @@
     comment: Limited Backup User
     shell: /bin/bash
   when: backup_user_create == True
+- include_vars: vars_rsnapshot_private.yml
+  run_once: yes
 - name: add backup ssh keys to servers
   authorized_key:
     user: "{{ backup_user }}"
     state: present
-    key: "{{ lookup('pipe','cat ./public_keys/rsnapshot/*.pub') }}"
+    key: "{{ backupuser_ssh_key }}"
 - name: copy rsync-wrapper.sh to remote host
   copy:
      src: rsync-wrapper.sh