Remove multi-platform builds

As it turns out building .NET is not yet ready for this.
Once this matures we can add it back.

more info: https://devblogs.microsoft.com/dotnet/improving-multiplatform-container-support/

.github/workflows/build-docker.yml

@@ -28,8 +28,8 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+      # - name: Set up QEMU
+      #   uses: docker/setup-qemu-action@v2
       
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
@@ -70,4 +70,4 @@ jobs:
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          platforms: linux/amd64,linux/arm/v7,linux/arm64/v8
+          # platforms: linux/amd64,linux/arm/v7,linux/arm64/v8