Fix repository URL to handle PR context correctly in release-0.9

- Use github.event.pull_request.head.repo.clone_url for PRs
- Falls back to current repository for non-PR contexts
- Ensures PIE can checkout from the correct fork repository

Signed-off-by: James Duong <[email protected]>

Author: jduo

.github/workflows/test-pie.yml

@@ -85,7 +85,7 @@ jobs:
                   "version_normalized": "1.0.0.0",
                   "source": {
                     "type": "git",
-                    "url": "${{ github.server_url }}/${{ github.repository }}",
+                    "url": "${{ github.event.pull_request.head.repo.clone_url || format('{0}/{1}', github.server_url, github.repository) }}",
                     "reference": "${{ github.head_ref || github.ref_name }}"
                   },
                   "type": "php-ext",