tributors: should not submit PRs to forks

[yarikoptic]

incident: jwodder#1

result of the merge of #4789 , might need workflow tune up, @vsoch - do you have a moment to tune it up to the "best con/tributors practices"?

[vsoch]

@yarikoptic I think that's in the settings for the repository?

[yarikoptic]

indeed, now that all forks have a copy of that workflow it would run for them as well, and they could selectively disable it in Settings -> Actions I guess, but IMHO it is simply not a desirable default behavior: most likely we should just limit that workflow to run only when ran on master of this (not any fork) repository.

[vsoch]

You could then have it stop before it does anything by defining it in the workflow, e.g.,

if: contains(github.repository, "datalad/datalad")
steps:
 - run: echo "I only run if datalad/datalad is running the action"

Not tested, but some derivative of the above should work :)

[yarikoptic]

thank you @vsoch,
Dear @jwodder , please add such conditioning