fix: further improvements to lint job

Signed-off-by: Bart Jaskulski <bjaskulski@protonmail.com>

includes/tests/lint.yml

@@ -7,9 +7,15 @@
     - composer install --no-dev
     - rm auth.json
   script:
-    - LINT=$(find . -name '*.php' -print0 |xargs -n1 -0 -P16 php -l)
-    - RESULT="$?"
-    - if [[ "$RESULT" -ne 0 ]]; then echo -e "$LINT" | grep -v 'No syntax errors'; fi
+    - |
+      LINT="$(find . -name '*.php' -print0 |xargs -n1 -0 -P16 php -l 2>&1)"; \
+      RESULT="$?"; \
+      if [[ "$RESULT" -ne 0 ]]; then
+        echo -e "$LINT" | grep -v 'No syntax errors';
+        exit 0;
+      else
+        exit "$RESULT"
+      fi
 
 lint:8.2:
   extends: .lint