config: enable API by adding a dummy gateway

Otherwise MatterBridge never listens on the API port.

Signed-off-by: Jakub Sokołowski <jakub@status.im>

templates/matterbridge.yaml.j2

@@ -23,7 +23,16 @@ api.api:
 # These are auto generated by Ansible #
 #######################################
 
+
 gateway:
+{% if matterbridge_api_enabled %}
+  - name: "api"
+    enable: true
+    inout:
+      - account: "api.api"
+        channel: "api"
+
+{% endif %}
 {% for gtw in matterbridge_gateways %}
   - name: "{{ gtw.status | default('bridge#'+(loop.index|string)) | mandatory }}"
     enable: "true"