Add GitHub App auth

[ollytheninja]

I don't know if this is the cleanest way to do it, but I have a requirement to use a GitHub App rather than a PAT. I have this working as a PoC now, planning on using it in anger before I mark it as "ready for review" but open to feedback / improvements :)

[peter-evans]

Hi @ollytheninja

Apologies for the slow response.

I would rather not add this support directly into the action. Please see this guidance for how to use GitHub app auth to generate tokens. It's documentation for a different action, but the same method applies for any actions where you want to use GitHub app auth.
https://github.com/peter-evans/create-pull-request/blob/main/docs/concepts-guidelines.md#authenticating-with-github-app-generated-tokens

[martinm82]

@peter-evans I am wondering how the action can actually work with a GitHub App. I have been testing this now for some time and cannot figure out how to get it working.

I believe that this will not work because the function here https://github.com/peter-evans/slash-command-dispatch/blob/main/src/github-helper.ts#L62 uses a GraphQL query to query collaborators and those need to be user accounts as far as I know.

This is the debug output of the action with using a GitHub App with really lot of permissions. I even gave it org admin r/w permissions:

##[debug]CollaboratorPermission: []
##[debug]Actor permission: none
##[debug]Actor permission level: 1
##[debug]Command permission level: 4
##[debug]Config matches on 'permission': []
Command 'integrate' is not configured for the user's permission level 'none'.