fix(ssh): use inline SSH key content

Co-authored-by: Copilot <copilot@github.com>

templates/root/.ssh/authorized_keys.j2

@@ -3,8 +3,8 @@
 #
 {% for authorized_key in root.ssh.authorized_keys %}
 {% if authorized_key.command is defined and authorized_key.command | length > 0 %}
-command="{{ authorized_key.command }}" {{ lookup('file', 'ssh/authorized_keys/' + authorized_key.filename ) }}
+command="{{ authorized_key.command }}" {{ authorized_key.content | trim }}
 {% else %}
-{{ lookup('file', 'ssh/authorized_keys/' + authorized_key.filename ) }}
+{{ authorized_key.content | trim }}
 {% endif %}
 {% endfor %}