ci: Test Envoy sync in PRs

Signed-off-by: Ryan Northey <[email protected]>

Author: phlax

.github/workflows/ci.yaml

@@ -12,4 +12,26 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: build and test
-        run: make docker_tests
+        run: make docker_tests
+
+  sync:
+    runs-on: ubuntu-latest
+    steps:
+    # Checkout the repo
+    - name: 'Checkout Repository'
+      uses: actions/checkout@v4
+      with:
+        path: go-control-plane
+
+    # Checkout the Envoy repo
+    - name: 'Checkout Repository'
+      uses: actions/checkout@v4
+      with:
+        repository: envoyproxy/envoy
+        ref: main
+        path: upstream
+
+    - run: ci/sync_envoy.sh
+      env:
+        ENVOY_SRC_DIR: ../envoy
+      working-directory: go-control-plane