devops: add s390x dockerfile

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

.devops/s390x.Dockerfile

@@ -0,0 +1,36 @@
+# vim: filetype=dockerfile
+
+ARG GCC_VERSION=15.2.0
+ARG UBUNTU_VERSION=24.10
+ARG SUPPORT_ZDNN=OFF
+
+FROM --platform=linux/s390x gcc:${GCC_VERSION} AS build
+RUN apt update -y \
+    && apt upgrade -y \
+    && apt install -y --no-install-recommends cmake \
+    && apt install -y --no-install-recommends libopenblas-openmp-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY . .
+
+RUN --mount=type=cache,target=/root/.ccache \
+    cmake -S . -B build -G Ninja \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DBUILD_SHARED_LIBS=OFF \
+        -DGGML_BLAS=ON \
+        -DGGML_BLAS_VENDOR=OpenBLAS \
+        -DGGML_ZDNN=$SUPPORT_ZDNN \
+    && cmake --build build --config Release -j $(nproc)
+
+RUN cmake --install build --prefix /opt/llama.cpp
+
+FROM --platform=linux/s390x scratch AS llama-server
+
+COPY --from=build /opt/llama.cpp/bin/llama-server /
+
+WORKDIR /models
+EXPOSE 8080
+
+ENTRYPOINT ["/llama-server"]