As of May 30th 20:14 UTC, install.php fails with:

$ install.php --with-extensions [..]
....
Modifying change_info field of table wb_changes ...done.
Populating wb_property_info
RuntimeException from line 132 of extensions/Wikibase/repo/includes/Store/Sql/PropertyInfoTableBuilder.php: Wikibase\PropertyInfoTableBuilder::rebuildPropertyInfo can not run with no Property namespace defined.
Backtrace:
#0 extensions/Wikibase/repo/includes/Store/Sql/DatabaseSchemaUpdater.php(215): Wikibase\PropertyInfoTableBuilder->rebuildPropertyInfo()
#1 includes/installer/DatabaseUpdater.php(482): Wikibase\Repo\Store\Sql\DatabaseSchemaUpdater::rebuildPropertyInfo(MysqlUpdater)
#2 includes/installer/DatabaseUpdater.php(450): DatabaseUpdater->runUpdates(array, boolean)
#3 maintenance/update.php(200): DatabaseUpdater->doUpdates(array)
#4 maintenance/doMaintenance.php(94): UpdateMediaWiki->execute()
#5 maintenance/update.php(245): require_once(string)
#6 {main}

T196062 is similar. The repo/autoload.php is not loaded when testing an extension having Wikibase has a dependency.

I think the issue is the Wikibase.php entry point relies on $wgWikimediaJenkinsCI being set. It is injected in LocalSettings.php AFTER the installation is complete. Hence the entry point always skip.

Change 436679 had a related patch set uploaded (by Hashar; owner: Hashar):
[mediawiki/extensions/Wikibase@master] Recognize JENKINS_URL in the entrypoint

https://gerrit.wikimedia.org/r/436679

Change 436679 abandoned by Hashar:
Recognize JENKINS_URL in the entrypoint

Reason:
My bad. install.php does work, but we fail later in update.php because the require_once is done before wgWikimediaJenkinsCI is set.

https://gerrit.wikimedia.org/r/436679

install.php --with-extensions does complete. The LocalSettings.php then has something like:

require_once "$IP/extensions/Wikibase/Wikibase.php";
wfLoadExtension( 'WikibaseQuality' );
wfLoadExtension( 'WikibaseQualityConstraints' );
wfLoadExtension( 'WikiEditor' );
wfLoadExtension( 'WikimediaBadges' );

# End of automatically generated settings.
# Add more configuration options below.

...

$wgWikimediaJenkinsCI = true;

Hence Wikibase.php does not have $wgWikimediaJenkinsCI = true; set yet. Need to be fixed in Quibble somehow.

Also the getenv('JENKINS_URL'); trick from https://gerrit.wikimedia.org/r/436679 does not work because Quibble does not pass the OS environment variables when running update.php:

def update(args, mwdir=None):

    update_env = {}
    if mwdir is not None:
        update_env['MW_INSTALL_PATH'] = mwdir

    p = subprocess.Popen(cmd, cwd=mwdir, env=update_env)

Change 437943 had a related patch set uploaded (by Hashar; owner: Hashar):
[integration/quibble@master] Prepend mediawiki configuration

https://gerrit.wikimedia.org/r/437943

Change 437943 merged by jenkins-bot:
[integration/quibble@master] Prepend mediawiki configuration

https://gerrit.wikimedia.org/r/437943

Change 437947 had a related patch set uploaded (by Hashar; owner: Hashar):
[integration/config@master] docker: quibble 0.0.18

https://gerrit.wikimedia.org/r/437947

Change 437948 had a related patch set uploaded (by Hashar; owner: Hashar):
[integration/config@master] Bump Quibble jobs to 0.0.18

https://gerrit.wikimedia.org/r/437948

Change 437947 merged by jenkins-bot:
[integration/config@master] docker: quibble 0.0.18

https://gerrit.wikimedia.org/r/437947

Change 437948 merged by jenkins-bot:
[integration/config@master] Bump Quibble jobs to 0.0.18

https://gerrit.wikimedia.org/r/437948

@Addshore first build ever passing https://integration.wikimedia.org/ci/job/quibble-vendor-mysql-hhvm-docker/4766/ \o/

There is a race condition somewhere though. The php7.0 job ended up failling. T191537#4263460