🌱 [scanner] fix: add fork guard to pull_request_target workflows

[clubanderson]

Fixes #5941
Fixes #5949

Adds fork guard (github.event.pull_request.head.repo.full_name == github.repository) to pull_request_target workflows to prevent write-permission exploitation from forks.

Signed-off-by: Copilot 223556219+Copilot@users.noreply.github.com

[netlify]

❌ Deploy Preview for kubestellar-docs failed. Why did it fail? →

Name	Link
🔨 Latest commit	3829971
🔍 Latest deploy log	https://app.netlify.com/projects/kubestellar-docs/deploys/6a33b38fad9d720008f5337a

[kubestellar-prow]

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[kubestellar-prow]

@clubanderson: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubestellar-docs-test	3829971	link	true	/test pull-kubestellar-docs-test

Full PR test history

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[Copilot]

Pull request overview

This PR mitigates a high-severity GitHub Actions security risk by adding a fork guard to pull_request_target workflows that currently run with write permissions, preventing execution on forked pull requests.

Changes:

• Add an if: fork-guard condition to the copilot-automation job in .github/workflows/copilot-automation.yml.
• Add the same if: fork-guard condition to the ai-fix job in .github/workflows/ai-fix.yml.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/copilot-automation.yml	Adds a job-level fork guard so the reusable workflow won’t run with write permissions on fork PRs.
.github/workflows/ai-fix.yml	Adds a job-level fork guard so the reusable workflow won’t run with write permissions on fork PRs.

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[github-actions]

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