Add conda-based CI test with caching

Author: tkittel

.github/resources/condamcplg4.yml

@@ -0,0 +1,13 @@
+name: mcplg4
+channels:
+  - nodefaults
+  - conda-forge
+dependencies:
+  - python==3.12
+  - compilers
+  - cmake
+  - make
+  #NB: Geant4 is added manually in workflow:  - geant4=11.1.3
+  - expat #TODO: Still needed? Maybe not after 11.3.0
+  - pip
+  - mcpl

.github/workflows/conda.yml

@@ -0,0 +1,117 @@
+name: conda
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron: '30 18 * * 0'  # 18:30 every Sunday
+
+jobs:
+  precheck:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          path: src
+      - name: Pip install deps
+        run: pip install ruff
+      - name: mcplg4devtool checks
+        run: ./src/devel/bin/mcplg4devtool --check
+
+  build:
+    needs: [ precheck ]
+    strategy:
+      #fail-fast: false
+      matrix:
+        include:
+          #NB: Due to cache size limitations we should have at most 3 or 4 platforms here!!
+          #NB: No Geant4 conda pkgs on windows
+          #NB: No linux-aarch64 geant4 pkg: - { os: ubuntu-24.04-arm, g4spec: 'geant4' }
+          - { os: ubuntu-latest, g4spec: 'geant4==11.1.3' }
+          - { os: ubuntu-latest, g4spec: 'geant4' }
+          - { os: macos-latest, g4spec:  'geant4==11.1.3' }
+          - { os: macos-13, g4spec:  'geant4' }
+    name: ${{ matrix.os }}-${{ matrix.g4spec }}
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        shell: bash -el {0}
+    env:
+      CONDA_SOLVER: libmamba
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          path: ./src
+
+      - name: Setup Miniforge
+        uses: conda-incubator/setup-miniconda@v3
+        with:
+          miniforge-version: latest
+          activate-environment: anaconda-client-env
+
+      - name: Get Date
+        id: get-date
+        run: echo "today=$(/bin/date -u '+%Y%m%d')" >> $GITHUB_OUTPUT
+        shell: bash
+
+      - name: Cache Conda env
+        id: cache
+        uses: actions/cache@v4
+        with:
+          path: ${{ env.CONDA }}/envs
+          key:
+            conda-${{ runner.os }}--${{ runner.arch }}--${{
+            steps.get-date.outputs.today }}-${{ matrix.g4spec }}-${{
+            hashFiles('./src/.github/resources/condamcplg4.yml') }}
+
+      - name: Update environment
+        if: steps.cache.outputs.cache-hit != 'true'
+        run: |
+          mamba env update -n anaconda-client-env -f ./src/.github/resources/condamcplg4.yml
+          mamba install -n anaconda-client-env "${{ matrix.g4spec }}"
+
+      - name: Inspect environment
+        run: |
+          conda info
+          conda list
+          set -x
+          cmake --version
+          pip list
+
+      #############################################
+      #TEMPORARY:
+      - name: TEMPORARY install MCPL2 from development branch
+        run: pip install "git+https://github.com/mctools/mcpl@path_to_mcpl2#subdirectory=mcpl_core"
+      ##################################
+
+      - name: Install source
+        run: pip install ./src
+
+
+      - name: Cfg example_write
+        run: cmake -S ./src/example_write -B ./bldexample_write -DCMAKE_INSTALL_PREFIX=./instexample_write
+
+      - name: Build example_write
+        run: cmake --build ./bldexample_write
+
+      - name: Install example_write
+        run: cmake --install ./bldexample_write
+
+      - name: Run example_write
+        run: ./instexample_write/bin/myapp
+
+      - run: mcpltool myoutput.mcpl.gz
+
+      - name: Cfg example_read
+        run: cmake -S ./src/example_read -B ./bldexample_read -DCMAKE_INSTALL_PREFIX=./instexample_read
+
+      - name: Build example_read
+        run: cmake --build ./bldexample_read
+
+      - name: Install example_read
+        run: cmake --install ./bldexample_read
+
+      - name: Run example_read
+        run: ./instexample_read/bin/myapp myoutput.mcpl.gz