security: block fork PRs from running on the self-hosted runner

[GeiserX]

Summary

Adds a fork-guard if: so pull_request-triggered CI jobs run on the self-hosted runner only for same-repo events, never for PRs from forks.

Why

On a public repo, a job that triggers on pull_request and runs on a self-hosted runner lets anyone's fork PR execute attacker-controlled code on the runner host. The guard keeps runs self-hosted for trusted events (push, schedule, workflow_dispatch, same-repo branch PRs) while skipping fork PRs. Same pattern already used in tailscale-rs.

if: >-
  github.event_name != 'pull_request' ||
  github.event.pull_request.head.repo.full_name == github.repository

Files: main.yml

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 738676c2-b4e5-40f1-975f-d2ab68c24938

📥 Commits

Reviewing files that changed from the base of the PR and between f414e41 and ea312e6.

📒 Files selected for processing (1)

• .github/workflows/main.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch security/fork-guard-self-hosted

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