Add optional CI run against python nightly #10213
Merged
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Description
This commit adds an optional CI run with python nightly. It is allowed to allow run failures, so even if the nightly run fails the whole CI still succeeds.
This can be useful for detecting breaking changes in newer python versions and tracking progress towards supporting them.
Runtime
This adds around 17 minutes to the total time calculated by travis.
Due to the fast_finish attribute the success of the CI can be determined, even if the nightly run isn't finished yet, therefor no actual runtime is added.