Attempt to make pageviews dir writable for unit tests

.github/workflows/ci.yml

@@ -10,6 +10,7 @@ on:
 jobs:
   python-tests:
     runs-on: ubuntu-20.04
+    options: --user root -v ${{ github.workspace }}:/tmp/pageviews/:rw
 
     services:
       # Unit test rely on a local MySQL instance with an empty root password.