Support custom properties through GraphQL API

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Moving over from /~https://github.com/orgs/community/discussions/69914#discussioncomment-9567289, it would be great if custom properties were available through the GraphQL API!

[gkohen]

None of these workaround is really feasible. If you are releasing a capability such as custom property in GA it should be supported by the leading API which is GraphQL. Doing so with the REST API(which does support querying) custom properties of repos is possible but it will create a huge burden with API calls on an org that has thousands of repositories resulting in GitHub rejecting calls because of an overload.

[gcrow]

Bumping this request. Even with enterprise rate limits I don't want to deal with custom properties via REST

[steinybot]

What's worse is that the list-organization-repositories REST API response doesn't even include the custom properties (even though the repository webhook event does). That means to get the value of a specific custom property from all 500 repositories in an organization it requires 505 requests instead of 5.