Migrate CI to CMake and cleanup old conda makefiles

.github/workflows/ci.yml

@@ -25,6 +25,42 @@ jobs:
         black -l 160 --check --diff .
 
   build:
+    strategy:
+      matrix:
+        python: ["3.12"]
+        root: ["6.32.10", "6.34.4"]
+
+    runs-on: ubuntu-latest
+    name: Compile (py${{ matrix.python }}, root${{ matrix.root }})
+
+    steps:
+    - uses: actions/checkout@master
+      with:
+        path: HiggsAnalysis/CombinedLimit # Required to match compile instructions
+    - name: Set up Conda
+      uses: conda-incubator/setup-miniconda@v3
+      with:
+        python-version: 3.12
+        miniforge-version: latest
+    - name: Install build environment
+      shell: bash -l {0}
+      run: |
+        # Install dependencies (synchronize with cms-combine-feedstock recipe.yaml)
+        mamba install -c conda-forge cmake python==${{ matrix.python }} pandas six gsl root_base==${{ matrix.root }} libboost-devel eigen vdt
+    - name: Build
+      shell: bash -l {0}
+      run: |
+        Python_SITELIB=$(python3 -c "import sysconfig;p=sysconfig.get_path('purelib');print(p)")
+        cmake -S HiggsAnalysis/CombinedLimit -B build -DCMAKE_INSTALL_PREFIX=$CONDA_PREFIX -DPython_SITELIB=$Python_SITELIB
+        cmake --build build --clean-first --parallel="${CPU_COUNT}"
+        cmake --install build  # Install to conda prefix (unsafe but ok for CI)
+    - name: Run tests
+      shell: bash -l {0}
+      run: |
+        cd HiggsAnalysis/CombinedLimit/test
+        python test_interference.py
+
+  legacy-build:
     strategy:
       matrix:
         python: ["3.8"]
@@ -33,39 +69,32 @@ jobs:
           # python 3.10 root 6.26
           - python: "3.10"
             root: "6.26.4"
-          # python 3.10 root 6.32 (not available yet)
-          #- python: "3.10"
-          #  root: "6.32" # version 6.30.07 where the conflicting classes were removed from root is not available, so compiling with 6.32.00 where this issue is resolved
 
     runs-on: ubuntu-latest
-    name: Compile (py${{ matrix.python }}, root${{ matrix.root }})
+    name: Legacy compile (py${{ matrix.python }}, root${{ matrix.root }})
 
     steps:
     - uses: actions/checkout@master
       with:
         path: HiggsAnalysis/CombinedLimit # Required to match compile instructions
     - name: Set up Conda
-      uses: conda-incubator/setup-miniconda@v2.2.0
+      uses: conda-incubator/setup-miniconda@v3
       with:
-        python-version: ${{ matrix.python }}
-        miniforge-variant: Miniforge3
-        channels: conda-forge,defaults
-        channel-priority: true
-        activate-environment: combine
+        python-version: 3.12
+        miniforge-version: latest
     - name: Install build environment
       shell: bash -l {0}
       run: |
-        mamba install -c conda-forge python==${{ matrix.python }} pip pandas root==${{ matrix.root }} gsl tbb vdt boost-cpp boost pcre eigen
-        cd HiggsAnalysis/CombinedLimit
-        bash set_conda_env_vars.sh
+        mamba install -c conda-forge cmake python==${{ matrix.python }} pip pandas root==${{ matrix.root }} gsl tbb vdt boost-cpp boost pcre eigen
     - name: Build
       shell: bash -l {0}
       run: |
-        cd HiggsAnalysis/CombinedLimit
-        make CONDA=1 -j 2
+        Python_SITELIB=$(python3 -c "import sysconfig;p=sysconfig.get_path('purelib');print(p)")
+        cmake -S HiggsAnalysis/CombinedLimit -B build -DCMAKE_INSTALL_PREFIX=$CONDA_PREFIX -DPython_SITELIB=$Python_SITELIB -DCMAKE_PREFIX_PATH=$CONDA_PREFIX
+        cmake --build build --clean-first --parallel="${CPU_COUNT}"
+        cmake --install build  # Install to conda prefix (unsafe but ok for CI)
     - name: Run tests
-      if: startsWith(matrix.python, '3.')
       shell: bash -l {0}
       run: |
         cd HiggsAnalysis/CombinedLimit/test
-        python test_interference.py
+        python test_interference.py