Add ruleset storage folder and issue triage ruleset exports

[Exairnous]

What?

Adds a folder for storing GitHub rulesets and adds the issue triage rulesets to it.

Why?

So that we have a place to store rulesets and the rulesets can be easily imported to new repositories and to serve as a source of truth.

Examples

N/A

How to test

if you have permission, you can test the rulesets with the following process.

1. Download the rulesets.
2. Go to the settings of one of the Hubs Foundation's repositories, select Rules -> Rulesets.
3. Select New ruleset -> Import a ruleset.
4. Select one of the rulesets you downloaded.
5. See that the ruleset is imported successfully (you can also check it against the corresponding ruleset in one of the Hubs Foundation's repositories and see that it matches).
6. Cancel the creation of the new ruleset.
7. Repeat for the other ruleset.

Documentation of functionality

None needed since this is just storage. These will likely be referenced at a later date in a policy for creating new repositories (but that has yet to be created).

Limitations

None.

Alternative implementations considered

None.

Open questions

None.

Additional details or related context

Discussed and decided on at the 2026-06-09 Hubs Dev Meetup

[github-actions]

Thank you for the pull request.

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[DougReeder]

imports into hubs-duck-addon fine