s390 builds are failing with

```
STEP 31/46: COPY {}from=registry.gitlab.com/redhat/rhel-ai/wheels/builder/llvm-triton${LLVM_TRITON_COMMIT}ubi9.6:latest /usr/lib64/llvm-triton${LLVM_TRITON_COMMIT} /usr/lib64/llvm-triton${LLVM_TRITON_COMMIT}
Trying to pull registry.gitlab.com/redhat/rhel-ai/wheels/builder/llvm-triton-86b69c31-ubi9.6:latest...
Error: COPY --from=registry.gitlab.com/redhat/rhel-ai/wheels/builder/llvm-triton-86b69c31-ubi9.6:latest: no stage or image found with that name
```

The issue is that for the vllm cpu packages, llvm-triton is not required/supported for s390x arch.

@cheimes indicated IBM should not modify the Dockerfile as the Dockerfile is for all arches. What other solutions are there?