run unit tests also with pcntl

Author: staabm

.github/workflows/ci.yaml

@@ -115,6 +115,11 @@ jobs:
           - "8.3"
           - "8.4"
 
+        include:
+          - os: ubuntu-latest
+            php-version: "8.3"
+            add-ext: ", pcntl"
+
     steps:
       - name: Configure Git to avoid issues with line endings
         if: matrix.os == 'windows-latest'