Multiplatform vttestserver build

Signed-off-by: Graham Campbell <[email protected]>

.github/workflows/docker_build_vttestserver.yml

@@ -27,6 +27,13 @@ jobs:
       - name: Check out code
         uses: actions/checkout@v3
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Login to Docker Hub
         uses: docker/login-action@v3
         with:
@@ -42,6 +49,7 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
+          platforms: linux/amd64,linux/arm64
           file: ${{ env.DOCKERFILE }}
           push: true
           tags: vitess/vttestserver:${{ matrix.branch }}
@@ -60,6 +68,7 @@ jobs:
         uses: docker/build-push-action@v5
         with:
           context: .
+          platforms: linux/amd64,linux/arm64
           file: ${{ env.DOCKERFILE }}
           push: true
-          tags: ${{ env.DOCKER_TAG }}
+          tags: ${{ env.DOCKER_TAG }}