no cache dir install

.github/workflows/ci-tests.yaml

@@ -24,7 +24,7 @@ jobs:
         run: |
           conda install -c conda-forge pygraphviz
           python --version
-          pip install -e .
+          pip install -e . --no-cache-dir
           pip install -e .[test]
           pip install pytest pytest-cov
         shell: bash -l {0}