Add test_e2e_upgrade job to GitHub workflow

Co-authored-by: mathetake <[email protected]>

Author: Copilot

.github/workflows/build_and_test.yaml

@@ -254,11 +254,43 @@ jobs:
       - uses: docker/setup-buildx-action@v3
       - run: make test-e2e-inference-extension
 
+  test_e2e_upgrade:
+    name: E2E Test for Upgrade (Envoy Gateway ${{ matrix.name }})
+    # TODO: make it possible to run this job on macOS as well, which is a bit tricky due to the nested
+    # virtualization is not supported on macOS runners.
+    # E.g. Use https://github.com/douglascamata/setup-docker-macos-action  per the comment in
+    # https://github.com/actions/runner-images/issues/17#issuecomment-1971073406
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name: latest
+            envoy_gateway_version: v0.0.0-latest
+          - name: v1.5.0
+            envoy_gateway_version: v1.5.0
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          cache: false
+          go-version-file: go.mod
+      - uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cache/go-build
+            ~/.cache/golangci-lint
+            ~/go/pkg/mod
+            ~/go/bin
+          key: e2e-test-${{ hashFiles('**/go.mod', '**/go.sum', '**/Makefile') }}
+      - uses: docker/setup-buildx-action@v3
+      - run: make test-e2e-upgrade
+
   docker_push:
     # Docker builds are verified in test_e2e job, so we only need to push the images when the event is a push event.
     if: github.event_name == 'push'
     name: Push Docker Images
-    needs: [unittest, test_crdcel, test_controller, test_extproc, test_e2e]
+    needs: [unittest, test_crdcel, test_controller, test_extproc, test_e2e, test_e2e_inference_extension, test_e2e_upgrade]
     uses: ./.github/workflows/docker_build_job.yaml
     secrets: inherit