add test runner for php8.0

Author: kohlerdominik

.github/workflows/run-tests.yml

@@ -22,9 +22,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [8.1, 8.2, 8.3, 8.4]
+        php: [8.0, 8.1, 8.2, 8.3, 8.4]
 
-    name: P${{ matrix.php }}
+    name: PHP${{ matrix.php }}
 
     steps:
       - name: Checkout code