ci(ua-blocker): restrict PR creation to only upstream repository

[3w36zj6]

In .github/workflows/ci-ua-blocker-sync.yml, the peter-evans/create-pull-request action specifies reviewers. However, in forked repositories, reviewers are not collaborators, causing the action to fail.

Since this workflow is triggered by a cron schedule, failure notifications are sent periodically. To address this, PR creation has been restricted to only the upstream repository.

Additional note: Even in the upstream repository, the specified reviewers are not collaborators, which appears to cause the same error¹. Removing the reviewers field altogether could also be considered.
It seems that in the initial PRs, reviewers were assigned correctly², so perhaps there has been a change in the GitHub API specification?

Create or update the pull request
  Attempting creation of pull request
  Created pull request #1526 (honojs:chore/sync-robots-json => main)
  Applying labels 'robots.json'
  Applying assignees 'finxol'
  Requesting reviewers 'finxol'
  Error: Reviews may only be requested from collaborators. One or more of the users or teams you specified is not a collaborator of the honojs/middleware repository. - https://docs.github.com/rest/pulls/review-requests#request-reviewers-for-a-pull-request

Footnotes

1. https://github.com/honojs/middleware/actions/runs/18796556639/job/53637301727 ↩

2. https://github.com/honojs/middleware/pull/1229 ↩

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[yusukebe]

@3w36zj6

Ah, I see! We should fix it.

Hey @BarryThePenguin Is the setting of this PR good?

[BarryThePenguin]

I'd probably just disable the entire workflow in forks with

jobs:
  sync-and-pr:
    if: ${{ github.event.repository.fork == false }}

[BarryThePenguin]

Looks good 👍🏻

I'm guessing we'll have to wait for the next Cron to trigger to make sure it works 😅

[yusukebe]

LGTM!

[yusukebe]

@3w36zj6 @BarryThePenguin Thanks!