Explicitly define the STORAGES setting

so we can override it later.

Note that DEFAULT_FILE_STORAGE and STATICFILES_STORAGE settings
have been deprecated since Django 4.2 and have been removed in Django 5.1!

tcms/settings/common.py

@@ -169,6 +169,17 @@
     }
 }
 
+# https://docs.djangoproject.com/en/5.1/ref/settings/#std-setting-STORAGES
+STORAGES = {
+    "default": {
+        "BACKEND": "django.core.files.storage.FileSystemStorage",
+    },
+    "staticfiles": {
+        "BACKEND": "django.contrib.staticfiles.storage.StaticFilesStorage",
+    },
+}
+
+
 # Absolute path to the directory static files should be collected to.
 # Don't put anything in this directory yourself; store your static files
 # in apps' "static/" subdirectories and in STATICFILES_DIRS.