Change in umask for Large runners

[jpreynat]

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Hi 👋

We've been using the GitHub-hosted runners for a while now, and I recently tried to switch our jobs to use the new large runners.
However, some of our tests have started failing as soon as I made the switch. Those tests include checks on file permissions.

After investigating a bit, it turns out that the umask value is different between the "original" GitHub-hosted runners ubuntu-latest, with a umask of 022, and the new ubuntu-latest-4-cores, for which the umask is 002.

This looks like a breaking change that can have a big impact on jobs running on GitHub actions.
On my end, I have tested running the umask 022 command before the actions/checkout but that didn't work. But maybe I'm just missing something?

[ossanna16]

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