Allow Pip to write to the cache

Author: popescu-v

.github/workflows/pip.yml

@@ -90,6 +90,9 @@ jobs:
           name: pip-package
       - name: Install package
         run: |
+          # Allow Pip to write to its cache
+          mkdir -p /github/home/.cache/pip
+          chown -R $(whoami) /github/home/.cache/pip
           pip install --upgrade pip
           pip install $(ls khiops*.tar.gz)
       - name: Test package / Git tag version coherence