It would be nice to scope the resulting token to certain repositories. I've created a PR to add an optional input allowing for this.

References:

• https://octokit.github.io/rest.js/v19#apps-create-installation-access-token
• https://docs.github.com/en/rest/apps/apps?apiVersion=2022-11-28#create-an-installation-access-token-for-an-app