Add debug flag

Author: Pete Bishop

.github/workflows/build-php.yml

@@ -155,7 +155,7 @@ jobs:
       - name: Build PHP
         run: |
           cd ../static-php-cli
-          ./bin/${{ env.SPC_BINARY }} build --build-cli "${{ env.PHP_EXTENSIONS }}" --with-libs="${{ env.PHP_LIBS }}"
+          ./bin/${{ env.SPC_BINARY }} build --build-cli "${{ env.PHP_EXTENSIONS }}" --with-libs="${{ env.PHP_LIBS }}" --debug
           cd ../php-bin
 
       - name: Get built PHP version