update docker script to llvm build

.github/DockerClang

@@ -1,31 +1,34 @@
 # docker buildx build --tag clang-p2996 --progress=plain -f .github/DockerClang --load .
 # docker tag clang-p2996 yaraslaut/clang-p2996
 # docker push yaraslaut/clang-p2996
-FROM ubuntu:latest
+FROM ubuntu:latest AS builder
 
-#git clone -b p2996 https://github.com/bloomberg/clang-p2996.git && \
+#git clone -b p2996 https://github.com/Yaraslaut/clang-p2996.git && \
 WORKDIR /
 RUN apt-get update
-RUN bash -c "\
-    set -ex && \
-    apt-get install -y cmake python3 ninja-build git lsb-release software-properties-common wget binutils gcc g++ && \
-    wget https://apt.llvm.org/llvm.sh && \
-    chmod +x llvm.sh && \
-    ./llvm.sh 18 && \
-    git clone -b p2996 https://github.com/Yaraslaut/clang-p2996.git && \
-    cmake -S /clang-p2996/llvm \
+RUN apt-get install -y cmake python3 ninja-build git lsb-release software-properties-common wget binutils gcc g++
+RUN wget https://apt.llvm.org/llvm.sh
+RUN chmod +x llvm.sh
+RUN ./llvm.sh 19
+RUN git clone -b p2996 https://github.com/bloomberg/clang-p2996.git
+RUN cmake -S /clang-p2996/llvm \
         -B build \
         -G Ninja \
-        -D CMAKE_CXX_COMPILER=clang++-18 \
-        -D CMAKE_C_COMPILER=clang-18 \
+        -D CMAKE_CXX_COMPILER=clang++-19 \
+        -D CMAKE_C_COMPILER=clang-19 \
         -D CMAKE_BUILD_TYPE=Release \
-        -D CMAKE_INSTALL_PREFIX=\/usr \
         -D LLVM_ENABLE_RUNTIMES='libcxx;libcxxabi;libunwind'\
         -D LLVM_ENABLE_PROJECTS=clang\
-        -D LLVM_TARGETS_TO_BUILD=X86 && \
-    cmake --build build --parallel && \
-    cmake --build build --target install && \
-    echo "/usr/lib/x86_64-unknown-linux-gnu" >> /etc/ld.so.conf.d/x86_64-linux-gnu.conf && \
-    ldconfig && \
-    rm -rf /build && \
-    rm -rf /clang-p2996"
+        -D LLVM_TARGETS_TO_BUILD=X86
+RUN cmake --build build --parallel
+RUN cmake --install build  --prefix /tmp/clang-install
+
+FROM ubuntu:latest
+# Install packages for minimal useful image.
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends build-essential  ca-certificates libcurl4-openssl-dev cmake make wget python3 sudo curl ninja-build git binutils && \
+    rm -rf /var/lib/apt/lists/*
+# Copy build results of stage 1 to /usr/local.
+COPY --from=builder /tmp/clang-install/ /usr/local/
+RUN P=`/usr/local/bin/clang++ -v 2>&1 | grep Target | cut -d' ' -f2-`; echo /usr/local/lib/$P > /etc/ld.so.conf.d/$P.conf
+RUN ldconfig