retrying failed gitlab CI external jobs (travis)

[Peter Maydell]

Hi; we now have travis's CI hooked into gitlab, which is nice. However,
unlike the gitlab native CI jobs, there's no UI for saying "retry this"
when the "travis CI" part of the overall gitlab pipeline fails.
This is awkward because travis seems to be prone to intermittent failures.
Is there any way we can make the jobs retryable?

thanks
-- PMM