ci: remove arm builds, amd64 only for now

.gitea/workflows/build-image.yml

@@ -32,18 +32,11 @@ jobs:
             echo "Building release image ${VERSION} from branch ${BRANCH}"
           fi
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
       - name: Build and push Docker image
         uses: docker/build-push-action@v5
         with:
           context: .
           push: true
-          platforms: linux/amd64,linux/arm64,linux/arm/v7
           tags: ${{ steps.meta.outputs.tags }}
           labels: |
             org.opencontainers.image.version=${{ steps.meta.outputs.version }}