buildx update smoke test

.github/workflows/buildx-smoke-test.yml

@@ -0,0 +1,46 @@
+name: Buildx Smoke Test
+
+on:
+  pull_request:
+    paths:
+      - ".github/workflows/buildx-smoke-test.yml"
+
+permissions:
+  contents: read
+
+jobs:
+  smoke-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@0c366fd6a839edf440554fa01a7085ccba70ac98 # v4.2.2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v4
+
+      - name: Inspect builder
+        run: docker buildx inspect --bootstrap
+
+      - name: Write smoke test Dockerfile
+        run: |
+          mkdir -p "$RUNNER_TEMP/buildx-smoke"
+          cat <<'EOF' > "$RUNNER_TEMP/buildx-smoke/Dockerfile"
+          FROM alpine:3.21
+          RUN printf 'buildx smoke test\n' > /smoke.txt
+          CMD ["cat", "/smoke.txt"]
+          EOF
+
+      - name: Build smoke test image
+        uses: docker/build-push-action@v7
+        with:
+          context: ${{ runner.temp }}/buildx-smoke
+          file: ${{ runner.temp }}/buildx-smoke/Dockerfile
+          load: true
+          platforms: linux/amd64
+          provenance: false
+          push: false
+          tags: local/buildx-smoke:${{ github.run_id }}
+
+      - name: Run smoke test image
+        run: docker run --rm local/buildx-smoke:${{ github.run_id }}