blubber.yaml: Run tests insecurely
blubber.yaml: Run tests insecurely

When running tests, eslint needs to write a cache file, so allow the
tests to run with safety mode off. This is safe to do as all we do in
the test suite is run the linter.

Bug: T213194
Change-Id: I003999e15a4eb99b8018407537bc8dc26aa1c25a

wikimedia/citoid,wikimedia/citoid,wikimedia/citoid