Update run_all_tests.yml (#77)

Fix #76

.github/workflows/run_all_tests.yml

@@ -152,23 +152,30 @@ jobs:
         uses: conda-incubator/setup-miniconda@v2
         with:
           auto-update-conda: true
-          auto-activate-base: true
-          activate-environment: true
           python-version: ${{ matrix.python-ver }}
 
       - name: Install build dependencies
         run: |
           conda config --set always_yes yes --set changeps1 no
           conda info
-          conda install -c conda-forge tox
-          conda list
+          # the conda dependency resolution for tox under python 3.7 can install the wrong importlib_metadata
+          conda install -c conda-forge tox "importlib_metadata>4"
+
+      - name: Conda reporting
+        run: |
+          conda info
+          conda config --show-sources
+          conda list --show-channel-urls
+
       - name: Run tox tests
         run: |
           tox -e ${{ matrix.test-tox-env }}
+
       - name: Build wheel and source distribution
         run: |
           tox -e ${{ matrix.build-tox-env }}
           ls -1 dist
+
       - name: Test installation from a wheel
         run: |
           tox -e wheelinstall --recreate --installpkg dist/*-none-any.whl