taskcluster: use Firefox from Mozilla PPA in docker image #51185
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The default apt package for Firefox in Ubuntu 22.04 is just a reference to a snap package and requires explicitly installing firefox using
snap install firefox
. However, snap doesn't work inside docker containers as it requires other services like systemd and snapd to be enabled and running.After moving to 22.04 in #51161, the missing firefox package causes failure in CI integration tests, specifically 'tests/test_wpt.py':
As a workaround, this patch adds Mozilla's PPA as an apt source and gives it higher priority than the default package. This has been tested locally and the integration test now passes with this patch.