Add optional testing requirements

.github/workflows/pipeline.yml

@@ -16,40 +16,24 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
-    - name: Get Date
-      id: get-date
-      run: echo "today=$(/bin/date -u '+%Y%m%d')" >> $GITHUB_OUTPUT
-      shell: bash
-
-    - name: Setup Conda Environment
-      uses: conda-incubator/setup-miniconda@v3
-      with:
-        miniforge-variant: Mambaforge
-        use-mamba: true
-        activate-environment: cadet-process
-        channels: conda-forge,
-
-    - name: Cache conda
-      uses: actions/cache@v3
-      env:
-        # Increase this value to reset cache if environment.yml has not changed
-        CACHE_NUMBER: 0
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
       with:
-        path: ${{ env.CONDA }}/envs
-        key: python_${{ matrix.python-version }}-${{ steps.get-date.outputs.today }}-${{ env.CACHE_NUMBER }}
+        python-version: ${{ matrix.python-version }}
 
     - name: Test Wheel install and import
       run: |
         pip install wheel
         which pip
+        which conda
         python setup.py bdist_wheel
         cd dist
         pip install CADET_Python*.whl
         python -c "import cadet; print(cadet.__version__)"
     - name: Test with pytest
       run: |
         pip install .[testing]
-        mamba install cadet
+        conda install cadet
         which cadet-cli
-        mamba list
+        conda list
         pytest tests --rootdir=tests -m "not slow"