T6771: Build docker image without Jenkins

.github/workflows/trigger-docker-image-build.yml

@@ -0,0 +1,47 @@
+name: Trigger Docker image build
+
+on:
+  pull_request_target:
+    types:
+      - closed
+    branches:
+      - current
+
+permissions:
+  packages: write
+  contents: read
+  attestations: write
+  id-token: write
+  pull-requests: read
+
+jobs:
+  track-changes:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+    
+    env:
+      REF: main  # Used for curl to trigger image build
+
+    steps:
+      - name: Checkout vyos/vyos-build repo
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.ref_name }}
+
+      - uses: dorny/paths-filter@v3
+        id: changes
+        with:
+          filters: |
+            docker-dir:
+              - 'docker/**'
+
+      - name: "Trigger Docker image build for ${{ github.ref_name }}"
+        if: ${{ steps.changes.outputs.docker-dir }}
+        run: |
+          curl -L \
+            -X POST \
+            -H "Accept: application/vnd.github+json" \
+            -H "Authorization: Bearer ${{ secrets.PAT }}" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/${{ secrets.REMOTE_OWNER }}/${{ secrets.REMOTE_REUSE_REPO }}/actions/workflows/build-docker-image.yml/dispatches \
+            -d '{"ref": "${{ env.REF }}", "inputs":{"branch":"${{ github.ref_name }}", "environment":"production"}}'