fix: add when condition to ssh_host_keys role

Follow the same approach in ssl_cert role, to avoid missing host key issue during deploy

ansible/roles/ssh_host_keys/tasks/main.yml

@@ -22,6 +22,7 @@
     aws_secret_key: "{{ LTS_SECRET_KEY }}"
   vars:
     ansible_python_interpreter: /usr/bin/python3
+  when: SSH_HOST_KEYS_S3_BUCKET | length > 0 and SSH_HOST_KEYS_S3_OBJECT | length > 0
 
 - name: Unpack SSH host keys to /etc/ssh
   ansible.builtin.unarchive:
@@ -31,6 +32,7 @@
     owner: root
     remote_src: yes
   become: true
+  when: SSH_HOST_KEYS_S3_BUCKET | length > 0 and SSH_HOST_KEYS_S3_OBJECT | length > 0
 
 - name: Remove the temporary folder after put in place
   ansible.builtin.file: