Some GitHub Actions should run only in the main repo, not in forks

[lornajane]

When I fork the repository, all the workflows run on the fork - but not all of them make sense there.

We can specify some jobs to run only on the main repo, as shown in GitHub docs

Suggested list of workflows that would be better on the main repo only:

• Label and close issues with no recent activity
• agenda
• .... what else?

[darrelmiller]

/cc @baywet

[baywet]

@lornajane please assign this to me (at least for agenda and label and close)
Also what would be the criteria? the org name? do you typically fork the repo within the same org?

[lornajane]

Assigned. I think if it's not this specific repo, most of these should not run, but I didn't look in detail at what we have and what they all do.

[baywet]

authored #3493