Parameterize repository URL to use current repo dynamically

- Use ${{ github.server_url }}/${{ github.repository }} instead of hardcoded URL
- Makes workflow portable across forks and different repositories
- Automatically uses the correct repository context

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": "https://github.com/valkey-io/valkey-glide-php.git",
+                    "url": "${{ github.server_url }}/${{ github.repository }}",
                     "reference": "${{ github.head_ref || github.ref_name }}"
                   },
                   "type": "php-ext",