parallel-lint is timing out and failing: https://gerrit.wikimedia.org/r/442209
@hashar thinks this is because:
[Wikibase has] a lot of php files. parallel-lint with HHVM is slow hence the 350 seconds timeout being reached. Can you fill it as another task please? It is probably missing a COMPOSER_PROCESS_TIMEOUT=600 and ideally we should only lint files that got changed by the patch (which we do for mediawiki/core).