Fix #3202 with conditional workflow

[loftwah]

Related issue

#3202

What changes does this PR do?

Adds a conditional workflow

Screenshots (If any)

Questions

[loftwah]

If you add a secret called EDDIEHUB_PAT with the appropriate permissions this should work.

This GitHub Actions workflow is designed to automatically comment on pull requests. It can work on both the main repository and forked repositories. The workflow uses two tokens: a Personal Access Token (PAT) named EDDIEHUB_PAT for the main repository, and the default GITHUB_TOKEN for forks or if the PAT is not set.

1. The workflow is triggered on pull request events and manual workflow dispatches.

2. An initial step sets an environment variable PAT_EXISTS to indicate whether EDDIEHUB_PAT is available.

3. Two conditional steps follow:

   • If the workflow is running in the main repository and PAT_EXISTS is true, it uses the PAT to comment on the pull request.
   • Otherwise, it uses the default GITHUB_TOKEN to comment.

[loftwah]

It works in my repo with my GH token.

[dan-mba]

This GitHub Actions workflow is designed to automatically comment on pull requests.

Because of the way actions run on pull_request for forks, they always run in the context of the forked repo. They don't have access to secrets from the main repo.

The trigger needs to be changed to pull_request_target and it will work without adding a PAT.

See the note about forked repos in the permissions section