✨ [#2173] Define map tile layer url on request

The map configuration can be edited at any moment. To make sure that we always return the correct tile layer url, fetch the url and add it to the component object dynamically. Using the mutate_config_dynamically we can now use the tile_layer_url for form steps and the form summary.

src/openforms/formio/components/custom.py

@@ -14,7 +14,7 @@
 from rest_framework.request import Request
 
 from openforms.authentication.service import AuthAttribute
-from openforms.config.models import GlobalConfiguration
+from openforms.config.models import GlobalConfiguration, MapTileLayer
 from openforms.submissions.models import Submission
 from openforms.typing import DataMapping
 from openforms.utils.date import TIMEZONE_AMS, datetime_in_amsterdam, format_date_value
@@ -189,6 +189,15 @@ def build_serializer_field(
 class Map(BasePlugin[Component]):
     formatter = MapFormatter
 
+    def mutate_config_dynamically(
+        self, component, submission: Submission, data: DataMapping
+    ) -> None:
+        if (identifier := component.get("tileLayerIdentifier")) is not None:
+            tile_layer = MapTileLayer.objects.filter(identifier=identifier).first()
+            if tile_layer is not None:
+                # Add the tile layer url information
+                component["tileLayerUrl"] = tile_layer.url
+
     @staticmethod
     def rewrite_for_request(component, request: Request):
         if component.get("useConfigDefaultMapSettings", False):