Rimuovi supporto linux/arm/v6 dal workflow

- Debian Bullseye non supporta arm/v6 (solo Pi Zero W v1 e Pi 1)
- Mantenuti arm/v7 e arm64 (compatibili con Pi 3, 4, 5)
- Pi 5 a 64-bit usa linux/arm64

.gitea/workflows/docker-build.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
         with:
-          platforms: linux/arm/v6,linux/arm/v7,linux/arm64
+          platforms: linux/arm/v7,linux/arm64
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
@@ -58,7 +58,7 @@ jobs:
         with:
           context: .
           file: ./Dockerfile.multiarch
-          platforms: linux/arm/v6,linux/arm/v7,linux/arm64
+          platforms: linux/arm/v7,linux/arm64
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}