find-appcast: new case with endpoint (#80836)

developer/bin/find-appcast

@@ -46,6 +46,7 @@ def find_electron_builder(app)
   data = YAML.load_file(appcast_file)
   bucket = data['bucket']
   channel = data['channel']
+  endpoint = data['endpoint']
   name = data['name']
   owner = data['owner']
   path = data['path']
@@ -63,6 +64,7 @@ def find_electron_builder(app)
     "https://s3.amazonaws.com/#{bucket}/#{path}/latest-mac.yml",
     "https://#{name}.#{region}.digitaloceanspaces.com/latest-mac.yml",
     "https://#{name}.#{region}.digitaloceanspaces.com/#{path}/latest-mac.yml",
+    "#{endpoint}/#{bucket}/#{path}/latest-mac.yml",
   ].map { |appcast| appcast.gsub(%r{(?<!:)/{2,}}, '/') } # Collapse groups of two or more forward slahses into one, except when preceded by a colon
 
   unless verify_appcast('electron-builder', *possible_appcasts)