Add workflow to trigger a docker build

Author: Llewellynvdm

.github/workflows/docker.yml

@@ -0,0 +1,25 @@
+name: Trigger Docker Build
+
+on:
+  push:
+    branches:
+      - 6.x
+
+jobs:
+  notify:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Trigger Octoleo JoomEngine
+        run: |
+          curl -X POST \
+            -H "Accept: application/vnd.github+json" \
+            -H "Authorization: Bearer ${{ secrets.REPO_OCTOLEO_TOKEN }}" \
+            https://api.github.com/repos/octoleo/joomengine/dispatches \
+            -d '{
+              "event_type": "pkg-component-builder-updated",
+              "client_payload": {
+                "ref": "${{ github.ref_name }}",
+                "sha": "${{ github.sha }}"
+              }
+            }'