feat: add custom ollama image with ROCm 6.1 + gfx906 support

- Add ollama/Dockerfile that builds ollama from source with AMDGPU_TARGETS=gfx906
- Uses ROCm 6.1 (rocm/dev-ubuntu-22.04:6.1.2-complete) for MI50 support
- Builds llama.cpp runner with HIPBLAS for gfx906 architecture
- Updates compose.yml to build from this Dockerfile instead of pulling ollama/ollama:latest

ai/ollama/Dockerfile

@@ -0,0 +1,57 @@
+# ollama-gfx906/Dockerfile
+#
+# Custom ollama image with ROCm 6.1 + gfx906 (MI50) support.
+# The default ollama/rocm image ships ROCm 7.2 which dropped gfx906 support.
+# This builds ollama from source targeting AMDGPU_TARGETS=gfx906.
+#
+# Build: docker build -t ollama/ollama:rocm-gfx906 .
+
+FROM rocm/dev-ubuntu-22.04:6.1.2-complete AS builder
+
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    git golang cmake build-essential pkg-config \
+    && rm -rf /var/lib/apt/lists/*
+
+ARG OLLAMA_VERSION=v0.13.5
+RUN git clone --depth 1 --branch ${OLLAMA_VERSION} https://github.com/ollama/ollama.git /build
+WORKDIR /build
+
+ENV HIP_PATH=/opt/rocm
+ENV ROCM_PATH=/opt/rocm
+ENV PATH=/opt/rocm/bin:/opt/rocm/hip/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+RUN cd llama.cpp && \
+    mkdir build && cd build && \
+    cmake .. \
+      -DLLAMA_HIPBLAS=ON \
+      -DCMAKE_C_COMPILER=clang \
+      -DCMAKE_CXX_COMPILER=clang++ \
+      -DAMDGPU_TARGETS=gfx906 \
+      -DCMAKE_BUILD_TYPE=Release \
+      -DLLAMA_NATIVE=OFF \
+      -DLLAMA_BUILD_TESTS=OFF \
+      -DLLAMA_BUILD_EXAMPLES=OFF \
+      -DLLAMA_BUILD_SERVER=OFF && \
+    cmake --build . --config Release -j$(nproc) && \
+    cmake --install . --prefix /build/dist
+
+ENV CGO_ENABLED=0
+RUN go build -trimpath -o dist/ollama .
+
+FROM ubuntu:22.04
+
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
+    ca-certificates curl libstdc++6 libgomp1 \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /opt/rocm/lib/ /opt/rocm/lib/
+COPY --from=builder /opt/rocm/share/ /opt/rocm/share/
+COPY --from=builder /build/dist/ollama /usr/bin/ollama
+COPY --from=builder /build/dist/lib/ /usr/lib/ollama/
+
+RUN ldconfig
+
+ENV LD_LIBRARY_PATH=/opt/rocm/lib:/usr/lib/ollama
+ENV HSA_OVERRIDE_GFX_VERSION=9.0.6
+
+EXPOSE 11434
+CMD ["serve"]