Julien Cristau
0a610dad9b
Add a "test-backstop" strategy (aliases skip-unless-backstop by default) and override it to "always" in the beta project overrides, alongside the existing "test" override. Update the apply_bug2043540_optimization transform to use "test-backstop" instead of "skip-unless-backstop" directly, so that the beta override correctly suppresses these tasks on every push. On beta backstop=True on every push, so using skip-unless-backstop directly caused macOS 10.15 mochitest-browser-chrome tasks to run on every push. Differential Revision: https://phabricator.services.mozilla.com/D308844