ci: run GitHub Actions test container as root

Author: aleks-iv

.github/workflows/test.yml

@@ -23,6 +23,7 @@ jobs:
       # the one of the container the tests run on.
       # You can switch this base image with a custom image tailored to your project
       image: ckan/ckan-dev:${{ matrix.ckan-image }}
+      options: --user root
     services:
       solr:
         image: ckan/ckan-solr:${{ matrix.ckan-version }}-solr9