adopting miniconda for pytest action

.github/workflows/mopper-pytest.yaml

@@ -25,18 +25,23 @@ jobs:
       uses: actions/[email protected]
       with:
         python-version: '3.10'
-    - name: Add conda to system path
-      run: |
-        # $CONDA is an environment variable pointing to the root of the miniconda directory
-        echo $CONDA/bin >> $GITHUB_PATH
+      - name: Install Miniconda
+        uses: conda-incubator/[email protected]
+        with:
+          auto-update-conda: true
+          python-version: ${{ matrix.python-version }}
+    #- name: Add conda to system path
+    #  run: |
+    #    # $CONDA is an environment variable pointing to the root of the miniconda directory
+    #    echo $CONDA/bin >> $GITHUB_PATH
     - name: Install dependencies
       run: |
         #conda config --set solver classic
         # this seems to slow it down!!!
         conda env update --file conda/test-env.yaml --name base 
     - name: Lint with ruff
       run: |
-        conda install -c conda-forge ruff --solver classic 
+        conda install -c conda-forge ruff #--solver classic 
         ruff check --output-format=github .
       continue-on-error: true
     # making sure we are testing installed package
@@ -45,7 +50,7 @@ jobs:
         pip install  -e .
     - name: Test with pytest
       run: |
-        conda install pytest coverage codecov --solver classic
+        conda install pytest coverage codecov #--solver classic
         conda install -c conda-forge pyfakefs 
         conda run python -m pytest
         #conda run coverage run --source src -m py.test