Remove QEMU setup from Docker build workflow

The QEMU setup step was redundant and has been removed to simplify the workflow. This change reduces unnecessary actions without impacting the Docker build process.

.gitea/workflows/docker-build.yml

@@ -17,9 +17,6 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
-
       - name: Login to Gitea Registry
         uses: docker/login-action@v3
         with: