I have also added a commit to the MR which enables the use of pybuild to run the tests, and then turns on pybuild-autopkgtest to enable a quicker migration of the package to testing:
https://salsa.debian.org/openstack-team/libs/python-doc8/-/merge_requests/4/diffs?commit_id=29e749091707ef49d7c531c702124a832fe5e4b8
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