feat: add QEMU setup for cross-platform Docker builds

Author: Slach

.github/workflows/build-gateway.yml

@@ -25,6 +25,9 @@ jobs:
       run: |
         git clone https://github.com/centralmind/gateway.git /tmp/gateway
 
+    - name: Set up QEMU
+      uses: docker/setup-qemu-action@v3
+      
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
 
@@ -57,5 +60,3 @@ jobs:
         labels: ${{ steps.meta.outputs.labels }}
         cache-from: type=gha
         cache-to: type=gha,mode=max
-        build-args: |
-          CGO_ENABLED=0