nodes metadata JSON ouput

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

.github/workflows/ci.yml

@@ -30,9 +30,16 @@ jobs:
         uses: actions/checkout@v3
       -
         name: Set up Docker Buildx
+        id: buildx
         uses: ./
         with:
           version: ${{ matrix.buildx-version }}
+      -
+        name: Nodes output
+        run: |
+          cat << EOF
+          ${{ steps.buildx.outputs.nodes }}
+          EOF
 
   multi:
     runs-on: ubuntu-latest