try container

Author: tgymnich

.github/workflows/ccpp.yml

@@ -28,6 +28,12 @@ on:
       - 'enzyme/CMakeLists.txt'
       - 'enzyme/CMakePresets.json'
   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:
@@ -41,18 +47,19 @@ jobs:
       matrix:
         llvm: ["15", "16", "17", "18"]
         build: ["Release"] # "RelWithDebInfo"
-        os: ["ubuntu:22.04"]
+        os: ["ubuntu:20.04"]
 
     timeout-minutes: 45
 
     steps:
     - name: add llvm 
       run: |
-          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
-          apt-get install -y libmpfr-dev
-          apt-add-repository "deb http://apt.llvm.org/`lsb_release -c | cut -f2`/ llvm-toolchain-`lsb_release -c | cut -f2`-${{ matrix.llvm }} main"
-          apt-get install -y cmake gcc g++ llvm-${{ matrix.llvm }}-dev libomp-${{ matrix.llvm }}-dev lld-${{ matrix.llvm }} clang-${{ matrix.llvm }} libclang-${{ matrix.llvm }}-dev libeigen3-dev libboost-dev libzstd-dev
-          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 clang-${{ matrix.llvm }} libclang-${{ matrix.llvm }}-dev libomp-${{ matrix.llvm }}-dev libblas-dev libeigen3-dev libboost-dev python3 python3-pip
     - uses: actions/checkout@v4
     - name: mkdir
       run: rm -rf build && mkdir build