feat: add drawio instance for nextcloud and opencloud

Signed-off-by: Bert-Jan Fikse <bert-jan@whatwedo.ch>

roles/opencloud/templates/csp-override.yaml.j2

@@ -7,6 +7,13 @@ directives:
 {% for url in opencloud_csp_extra_connect_src %}
     - "{{ url }}"
 {% endfor %}
+{% if opencloud_csp_extra_frame_src | length > 0 %}
+  frame-src:
+    - "'self'"
+{% for url in opencloud_csp_extra_frame_src %}
+    - "{{ url }}"
+{% endfor %}
+{% endif %}
   script-src:
     - "'self'"
     - "'unsafe-inline'"