Fix url for object store artifacts

changelogs/unreleased-ee/fix-public-url-for-object-store.yml

+---
+title: Fix url for object store artifacts
+merge_request:
+author:
+type: fixed

config/initializers/1_settings.rb

@@ -332,8 +332,8 @@ Settings.artifacts['max_size']   ||= 100 # in megabytes
 Settings.artifacts['object_store'] ||= Settingslogic.new({})
 Settings.artifacts['object_store']['enabled'] = false if Settings.artifacts['object_store']['enabled'].nil?
 Settings.artifacts['object_store']['remote_directory'] ||= nil
-# Convert upload connection settings to use symbol keys, to make Fog happy
-Settings.artifacts['object_store']['connection']&.deep_symbolize_keys!
+# Convert upload connection settings to use string keys, to make Fog happy
+Settings.artifacts['object_store']['connection']&.deep_stringify_keys!
 
 #
 # Registry

spec/support/stub_artifacts.rb

 module StubConfiguration
   def stub_artifacts_object_storage(enabled: true)
     Fog.mock!
-    allow(Gitlab.config.artifacts.object_store).to receive_messages(
-      enabled: enabled,
-      remote_directory: 'artifacts',
-      connection: {
-        provider: 'AWS',
-        aws_access_key_id: 'AWS_ACCESS_KEY_ID',
-        aws_secret_access_key: 'AWS_SECRET_ACCESS_KEY',
-        region: 'eu-central-1'
-      }
+    object_store = Settingslogic.new(
+      'enabled' => enabled,
+      'remote_directory' => 'artifacts',
+      'connection' => Settingslogic.new(
+        'provider' => 'AWS',
+        'aws_access_key_id' => 'AWS_ACCESS_KEY_ID',
+        'aws_secret_access_key' => 'AWS_SECRET_ACCESS_KEY',
+        'region' => 'eu-central-1'
+      )
     )
 
+    allow(Gitlab.config.artifacts).to receive(:object_store) { object_store }
     allow_any_instance_of(ArtifactUploader).to receive(:verify_license!) { true }
 
     return unless enabled