Display BuildKit container logs

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

.github/workflows/ci.yml

@@ -77,6 +77,34 @@ jobs:
           echo "Flags:     ${{ steps.buildx2.outputs.flags }}"
           echo "Platforms: ${{ steps.buildx2.outputs.platforms }}"
 
+  debug:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Create Dockerfile
+        run: |
+          cat > ./Dockerfile <<EOL
+          FROM alpine
+          RUN uname -a
+          EOL
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: ./
+        with:
+          buildkitd-flags: --debug
+      -
+        name: Build
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64,linux/ppc64le
+
   install:
     runs-on: ubuntu-latest
     steps: