fix: use cmake -B to override preset binaryDir, cmake --build/--install use explicit path

ai/ollama/Dockerfile

@@ -45,12 +45,12 @@ ENV LDFLAGS=-s
 # Pre-set CMAKE_HIP_COMPILER="" to prevent check_language(HIP) from
 # finding a HIP compiler (it searches /opt/rocm even without PATH).
 # Remove /opt/rocm from PATH to prevent find_program from finding hipcc.
-RUN mkdir -p build-cpu && cd build-cpu && \
+RUN mkdir -p build-cpu && \
     PATH=/usr/local/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin \
-    cmake .. -DCMAKE_BUILD_TYPE=Release \
+    cmake -B build-cpu -DCMAKE_BUILD_TYPE=Release \
       -DCMAKE_HIP_COMPILER="" && \
-    cmake --build . --target ggml-cpu -- -l $(nproc) && \
-    cmake --install . --component CPU --strip --prefix /build/dist
+    cmake --build build-cpu --target ggml-cpu -- -l $(nproc) && \
+    cmake --install build-cpu --component CPU --strip --prefix /build/dist
 
 # Step 2: Build HIP backend with ROCm preset + gfx906 target only
 # The ROCm 6 preset enables HIP language detection (enable_language(HIP))
@@ -58,14 +58,14 @@ RUN mkdir -p build-cpu && cd build-cpu && \
 # OLLAMA_RUNNER_DIR=rocm from the preset, so HIP goes to lib/ollama/rocm/
 # Need CMAKE_PREFIX_PATH so find_package(hip) finds hip-config.cmake
 # at /opt/rocm/lib/cmake/hip/hip-config.cmake.
-RUN mkdir -p build-hip && cd build-hip && \
-    cmake .. \
+RUN mkdir -p build-hip && \
+    cmake -B build-hip \
       --preset 'ROCm 6' \
       -DAMDGPU_TARGETS="gfx906:xnack-" \
       -DCMAKE_BUILD_TYPE=Release \
       -DCMAKE_PREFIX_PATH="/opt/rocm" && \
-    cmake --build . --target ggml-hip -- -l $(nproc) && \
-    cmake --install . --component HIP --strip --prefix /build/dist && \
+    cmake --build build-hip --target ggml-hip -- -l $(nproc) && \
+    cmake --install build-hip --component HIP --strip --prefix /build/dist && \
     echo "=== HIP install ===" && \
     find /build/dist/lib/ollama -type f -o -type l | head -20