[issue39837] Make Azure Pipelines optional on GitHub PRs

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> Let's just hope that Travis has stabilised compared to when we switched away from it, and maybe they have enough capacity now to handle our busy periods.

Can't we be more flexible depending on the stability on CIs over the last weeks? I mean making a CI optional if it becomes flaky, but also try to make a CI mandatory when it becomes stable.

In my experience, no CI is reliable and the stability varies a lot over time.

In the past, the macOS job was very reliable. I have no idea why it became so flaky, but I don't have the bandwidth to investigate, moreover it seems like some issues are internal to Azure Pipelines / GH Actions, and I don't have access to these.

I'm trying to do the best with my limited time.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39837>
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