originally posted by @harshtrivedi134 at octokit/octokit.js#2569

Describe the need

Reference from discussion
I was creating an access token for a github app installed in a different organization and repository. I learned about https://github.com/actions/create-github-app-token#create-a-token-for-all-repositories-in-another-owners-installation.

Similar to the baseUrl option in Octokit constructor, it would be great if we could specify the github API url as an input to this action

 - uses: actions/create-github-app-token@v1 id: get-access-token with: app-id: APP_ID private-key: PRIVATE_KEY base-url: https://slack-github.com/api/ 

I tried creating an access token for my github app installed in a different organization by specifying the owner and repository using the following:

 - uses: actions/create-github-app-token@v1 id: get-access-token with: app-id: APP_ID private-key: PRIVATE_KEY owner: "owner" repositories: | owner/repo_name 

However, the default github API hostname/url is set to api.github.com and we cannot change it to a custom hosted github installation.

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