ci(integrations): add test workflow to test trigger

Signed-off-by: Árpád Csepi <csepi.arpad@outlook.com>

Author: arpad-csepi

.github/workflows/test-repository-dispatch.yaml

@@ -0,0 +1,19 @@
+# Copyright AGNTCY Contributors (https://github.com/agntcy)
+# SPDX-License-Identifier: Apache-2.0
+
+name: test-repository-dispatch-trigger
+on:
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+    trigger-integration-workflow:
+        permissions:
+            contents: 'write'
+        runs-on: ubuntu-latest
+        steps:
+        - name: Repository Dispatch
+          uses: peter-evans/repository-dispatch@v3
+          with:
+            event-type: test_image
+            client-payload: '{"directory-image-tag": "v0.2.1", "gateway-image-tag": "0.3.11"}'