improve cpp ci

.github/workflows/ccpp.yml

@@ -8,37 +8,49 @@ on:
     branches:
     - main
   merge_group:
+
+concurrency:
+   # Skip intermediate builds: always.
+   # Cancel intermediate builds: only if it is a pull request build.
+   group: ${{ github.workflow }}-${{ github.ref }}
+   cancel-in-progress: ${{ startsWith(github.ref, 'refs/pull/') }}
 
 jobs:
   build:
     name: Integration CI LLVM ${{ matrix.llvm }} ${{ matrix.build }} ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
+    container:
+      image: ${{ matrix.os }}
+      options: --user root
 
     strategy:
       fail-fast: false
       matrix:
         llvm: ["15", "16", "17", "18"]
         build: ["Release"] # "RelWithDebInfo"
-        os: [ubuntu-20.04]
+        os: ["ubuntu:20.04"]
 
     timeout-minutes: 45
 
     steps:
     - name: add llvm 
       run: |
-          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key|sudo apt-key add -
-          sudo apt-get install -y libmpfr-dev
-          sudo apt-add-repository "deb http://apt.llvm.org/`lsb_release -c | cut -f2`/ llvm-toolchain-`lsb_release -c | cut -f2`-${{ matrix.llvm }} main" || true
-          sudo apt-get install -y cmake gcc g++ llvm-${{ matrix.llvm }}-dev libomp-${{ matrix.llvm }}-dev lld-${{ matrix.llvm }} clang-${{ matrix.llvm }} libclang-${{ matrix.llvm }}-dev libeigen3-dev libboost-dev libzstd-dev
-          sudo python3 -m pip install --upgrade pip lit
+        apt-get -q update
+        apt-get install -y --no-install-recommends ca-certificates software-properties-common curl gnupg2
+        curl -fsSL https://apt.llvm.org/llvm-snapshot.gpg.key|apt-key add -
+        apt-add-repository -y "deb http://apt.llvm.org/`lsb_release -cs`/ llvm-toolchain-`lsb_release -cs`-${{ matrix.llvm }} main"
+        apt-get -q update
+        apt-get install -y --no-install-recommends sudo git ssh zlib1g-dev libzstd-dev automake autoconf cmake make lldb ninja-build gcc g++ gfortran build-essential libtool llvm-${{ matrix.llvm }}-dev clang-format clangd lld-${{ matrix.llvm }} clang-${{ matrix.llvm }} libclang-${{ matrix.llvm }}-dev libomp-${{ matrix.llvm }}-dev libblas-dev libeigen3-dev libboost-dev python3 python3-pip
+        python3 -m pip install --upgrade pip lit
     - uses: actions/checkout@v4
     - name: mkdir
       run: rm -rf build && mkdir build
     - name: cmake
       working-directory: build
       run: cmake ../enzyme -DLLVM_EXTERNAL_LIT=`which lit` -DCMAKE_BUILD_TYPE=${{ matrix.build }} -DLLVM_DIR=/usr/lib/llvm-${{ matrix.llvm }}/lib/cmake/llvm
     - name: make
-      run: cd build && make -j `nproc` LLVMEnzyme-${{ matrix.llvm }} ClangEnzyme-${{ matrix.llvm }} LLDEnzyme-${{ matrix.llvm }}  
+      working-directory: build
+      run: make -j `nproc` LLVMEnzyme-${{ matrix.llvm }} ClangEnzyme-${{ matrix.llvm }} LLDEnzyme-${{ matrix.llvm }}  
     - name: make test-cmake
       working-directory: build
       run: make -j `nproc` test-cmake