try on native s390x

.forgejo/workflows/build.yaml

@@ -12,7 +12,7 @@ env:
 
 jobs:
   build_besu:
-    runs-on: ubuntu-latest
+    runs-on: linux-s390x
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
@@ -30,7 +30,6 @@ jobs:
       - name: Build and push to gitea registry
         uses: docker/build-push-action@v6
         with:
-          platforms: linux/s390x
           push: true
           context: .
           build-args: |