Issue #3049585 by jonathan1055: Ensure _PHPUNIT_CONCURRENT=1 when using SYMFONY_DEPRECATIONS_HELPER

.gitlab-ci.yml

@@ -100,6 +100,12 @@ phpstan:
     - php $CI_PROJECT_DIR/scripts/phpstan-baseline-summary.php phpstan-baseline-to-fix.neon
 
 # Do not automatically run, but allow the jobs to be started manually.
+phpstan (max PHP version):
+  rules:
+    - !reference [ .opt-in-max-php-rule ]
+    - !reference [ .skip-phpstan-rule ]
+    - when: manual
+
 phpstan (next minor):
   rules:
     - !reference [ .opt-in-next-minor-rule ]
@@ -157,7 +163,8 @@ phpunit (next minor):
     # To do this the .phpunit-tests-exist-rule has to be removed.
     - when: manual
   variables:
-    # Use core ignoreFile to show deprecations.
+    # Use core ignoreFile to show deprecations. This is only used when $_PHPUNIT_CONCURRENT=1 so make sure that is also set.
+    _PHPUNIT_CONCURRENT: 1
     SYMFONY_DEPRECATIONS_HELPER: "ignoreFile=$CI_PROJECT_DIR/$_WEB_ROOT/core/.deprecation-ignore.txt"
 
 phpunit (next major):
@@ -166,5 +173,6 @@ phpunit (next major):
     - !reference [ .skip-phpunit-rule ]
     - when: manual
   variables:
-    # Use core ignoreFile to show deprecations.
+    # Use core ignoreFile to show deprecations. This is only used when $_PHPUNIT_CONCURRENT=1 so make sure that is also set.
+    _PHPUNIT_CONCURRENT: 1
     SYMFONY_DEPRECATIONS_HELPER: "ignoreFile=$CI_PROJECT_DIR/$_WEB_ROOT/core/.deprecation-ignore.txt"