Numerous repositories have published coverage reports, and as such, it'd be useful if CI ran the coverage difference checker both on patches, and also on demand using check coverage like we already do for MW core, extensions etc

- name: mediawiki/libs/IPUtils
  template:
    - name: composer-test-package-php72-or-later
  postmerge:
    - doxygen-publish
    - phpunit-coverage-php72-docker-publish

Presumably this will require adding a phpunit-coverage-php72-patch-docker to go with phpunit-coverage-php72-docker-publish like we do for extension-coverage

- name: extension-coverage
  postmerge:
    - mwext-phpunit-coverage-docker-publish
  coverage:
    - mwext-phpunit-coverage-patch-docker