Install QEMU for s390x (#4610)

Author: lucacome

.github/workflows/build-plus.yml

@@ -48,7 +48,7 @@ jobs:
       - name: Setup QEMU
         uses: docker/setup-qemu-action@68827325e0b33c7199eb31dd4e31fbe9023e06e3 # v3.0.0
         with:
-          platforms: arm64
+          platforms: arm64,s390x
         if: github.event_name != 'pull_request'
 
       - name: Docker Buildx