The mwext-phpunit-coverage-docker-publish are failing for all merged patches. `Cannot open file "/workspace/src/extensions/Wikibase/tests/phpunit.php".` sounds suspicious.
See e.g.
* https://integration.wikimedia.org/ci/job/mwext-phpunit-coverage-docker-publish/17450/console
```lines=5
14:07:54 INFO:quibble.commands:mwext-phpunit-coverage
14:07:54 ++ basename mediawiki/extensions/Wikibase
14:07:54 + EXT_NAME=Wikibase
14:07:54 + phpunit-suite-edit /workspace/src/tests/phpunit/suite.xml --cover-extension Wikibase
14:07:54 + mkdir -p /workspace/cover
14:07:54 + find /workspace/cover -mindepth 1 -delete
14:07:54 + set +e
14:07:54 + [[ ! -v CODEHEALTH ]]
14:07:54 + cover_pid=2275
14:07:54 + relay_signals SIGINT SIGTERM
14:07:54 + for signal in "$@"
14:07:54 + trap 'kill -$signal $cover_pid; wait $cover_pid' SIGINT
14:07:54 + for signal in "$@"
14:07:54 + trap 'kill -$signal $cover_pid; wait $cover_pid' SIGTERM
14:07:54 + wait 2275
14:07:54 + php -d zend_extension=xdebug.so /workspace/src/tests/phpunit/phpunit.php --testsuite extensions --coverage-clover /workspace/log/clover.xml --coverage-html /workspace/cover --log-junit /workspace/log/junit.xml /workspace/src/extensions/Wikibase/tests/phpunit
14:07:54 Using PHP 7.2.26-1+0~20191218.33+debian9~1.gbpb5a340+wmf1
14:07:54 Cannot open file "/workspace/src/extensions/Wikibase/tests/phpunit.php".
14:07:54
14:07:54 + set -e
14:07:54 + '[' -f /workspace/log/junit.xml ']'
14:07:54 + [[ ! -v CODEHEALTH ]]
14:07:54 + test -f /workspace/cover/index.html
14:07:54 INFO:backend.DevWebServer:Terminating DevWebServer
14:07:54 INFO:quibble.cmd:<<< Finish: User commands: mwext-phpunit-coverage, in 0.372 s
14:07:54 Traceback (most recent call last):
14:07:54 File "/usr/local/bin/quibble", line 11, in <module>
14:07:54 load_entry_point('quibble==0.0.40', 'console_scripts', 'quibble')()
14:07:54 File "/usr/local/lib/python3.5/dist-packages/quibble/cmd.py", line 467, in main
14:07:54 cmd.execute(plan)
14:07:54 File "/usr/local/lib/python3.5/dist-packages/quibble/cmd.py", line 289, in execute
14:07:54 command.execute()
14:07:54 File "/usr/local/lib/python3.5/dist-packages/quibble/commands.py", line 730, in execute
14:07:54 cmd, shell=True, cwd=self.mw_install_path)
14:07:54 File "/usr/lib/python3.5/subprocess.py", line 271, in check_call
14:07:54 raise CalledProcessError(retcode, cmd)
14:07:54 subprocess.CalledProcessError: Command 'mwext-phpunit-coverage' returned non-zero exit status 1
```