Fix broken-changes action for fork PRs

[Copilot]

The broken-changes workflow fails for external contributors with "Resource not accessible by integration" because GITHUB_TOKEN lacks write permissions for fork PRs.

Changes

• Added conditional to skip comment posting for fork PRs: github.event.pull_request.head.repo.full_name == github.repository
• Preserved always() to run regardless of prior step failures
• Added inline comment explaining the fork permission constraint

Behavior

• Internal PRs: gorelease analysis runs → comment posted
• Fork PRs: gorelease analysis runs → comment skipped (no error)
• Analysis output remains visible in "Print API changes" step for all PRs

Original prompt

---

This section details on the original issue you should resolve

<issue_title>bug: broken-changes action alway failed for external contributors</issue_title>
<issue_description># Bug Report

Current behavior:

broken-changes actions failled.

Run marocchino/sticky-pull-request-comment@v2
  with:
    path: changes.txt
    GITHUB_TOKEN: ***
    header: gorelease
    append: false
    recreate: false
    delete: false
    only_create: false
    only_update: false
    hide_details: false
    hide: false
    hide_and_recreate: false
    hide_classify: OUTDATED
    ignore_empty: false
    skip_unchanged: false
    follow_symbolic_links: false
  env:
    GO111MODULE: on
Error: Resource not accessible by integration - https://docs.github.com/rest/issues/comments#create-an-issue-comment

Failed actions example

Expected behavior:

No errors.
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes bug: broken-changes action alway failed for external contributors #1883

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[github-actions]

summary

Base version: v3.117.2-0.20251024101740-fda5a9d2c204 (master)
Cannot suggest a release version.
Can only suggest a release version when compared against the most recent version of this major: v3.117.1.

[Copilot]

Pull Request Overview

This PR fixes a permissions issue where the broken-changes workflow fails when external contributors open pull requests from forks, preventing the "Resource not accessible by integration" error.

• Adds conditional logic to skip posting comments for fork PRs while preserving gorelease analysis
• Maintains always() execution guarantee for internal PRs
• Documents the fork permission constraint with an inline comment

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