feat: gate the upload replacement file behind a feature flag

config/packages/flagception.yaml

@@ -13,3 +13,6 @@ flagception:
         myep_login:
             default: false
             env: FEATURE_MYEP_LOGIN
+        upload_replacement:
+            default: false
+            env: FEATURE_UPLOAD_REPLACEMENT

config/services.yaml

@@ -50,6 +50,11 @@ parameters:
 
     teamer_inactive_period: '-2 years'
 
+    # The stand-in PDF served instead of real uploads while the upload_replacement feature is
+    # on. Relative to the project dir. Which file is a fixed fact of the repo; whether it is
+    # used at all is the feature flag's job alone.
+    upload_replacement_file: 'assets/pdf/chicken.pdf'
+
     # The contract upload period, counted from the creation of the disposition. This is the
     # single definition: the reminder mail, the "Honorarvertrag fällig" flag on the teamer
     # dashboard, the admin list of overdue contracts and the wording of the mails all read it,
@@ -262,8 +267,7 @@ services:
         arguments:
             $orphanageManager: '@oneup_uploader.orphanage_manager'
             $projectDir: '%kernel.project_dir%'
-            $environment: '%kernel.environment%'
-            $uploadReplacementFile: '%env(default::UPLOAD_REPLACEMENT_FILE)%'
+            $uploadReplacementFile: '%upload_replacement_file%'
 
     App\Service\Pdf\Sanitizer:
         arguments: