woodpecker test workflow updated

.woodpecker.yaml

@@ -1,9 +1,8 @@
-pipeline:
-  test:
+steps:
+  - name: test
     image: php:7.4-cli
     commands:
       - apt-get update && apt-get install -y git
-      - php -l wpa-superstar-plugin.php  # Syntax check
-      - php -l admin/settings.php
-      - php -l includes/speed-functions.php
-      - echo "Basic linting passed"
+      - php -l wp-allstars-plugin.php  # Syntax check
+      - find . -name *.php -exec php -l {} \;
+      - echo "Basic linting passed"