The `repositories` input doesn't play nicly with `github.repository`

[Cube707]

When passing in a list of repos to scope the app's access to, github.repository can't be used (supprisingly).
Also building specific repos using ${{github.repository_owner}}/repo doesn't work.

This would be usefull when working across forks and / or reusing workflow snippets.

---

• improve documentation to better reflect what input is expected
• filter the inputs to work with owners
• generally add github.repositor_name upstream into the github-context

[MPV]

Not sure if I just opened a duplicate of this one...?

Linking it here for reference / comparison:

• Support repositories: ${{ github.repository }} #185

[Cube707]

Not sure if I just opened a duplicate of this one...?

more or less, this issue is more broad and you have a specific example case for this request.