Restrict some GH actions to not run on forks

[marekdedic]

Closes #1046

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Latest commit: fe93f6e

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[marekdedic]

Hmm, I think the CI failure is unrelated to the changes in this PR?

[ota-meshi]

I still don't know what causes the problem, but this PR looks good so I will merge it.
Thank you!