add multi-arch docker builds

Signed-off-by: Peter St. John <pstjohn@nvidia.com>

Author: pstjohn

.github/workflows/unit-tests.yml

@@ -79,6 +79,9 @@ jobs:
         with:
           submodules: "recursive"
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -106,6 +109,7 @@ jobs:
       - name: Build and push
         uses: docker/build-push-action@v5
         with:
+          platforms: linux/amd64,linux/arm64
           push: true
           tags: ${{ steps.metadata.outputs.tags }}
           labels: ${{ steps.metadata.outputs.labels }}