SREMG-166: Apply the Mailgun load-balancer patch on top of v2.11.2

.github/workflows/build_and_push.yml

@@ -0,0 +1,41 @@
+name: On Pull Request
+
+on:
+  pull_request:
+    branches: [v2.11.2-patched]
+
+jobs:
+  test:
+    name: build_and_push
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Setup Docker Layer Cache
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-docker-${{ github.event.number }}
+          restore-keys: ${{ runner.os }}-docker-
+
+      # Buildx Needs QEMU
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      # We use Buildx so we can take advantage of the caching
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ github.token }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          tags: ghcr.io/${{ github.repository }}:PR${{ github.event.number }}
+          push: true