Allow to use access_token in GitLab CI API

lib/api/helpers.rb

@@ -2,14 +2,17 @@ module API
   module Helpers
     PRIVATE_TOKEN_PARAM = :private_token
     PRIVATE_TOKEN_HEADER = "HTTP_PRIVATE_TOKEN"
+    ACCESS_TOKEN_PARAM = :access_token
+    ACCESS_TOKEN_HEADER = "HTTP_ACCESS_TOKEN"
     UPDATE_RUNNER_EVERY = 60
     def current_user
       @current_user ||= begin
         options = {
-          private_token: (params[PRIVATE_TOKEN_PARAM] || env[PRIVATE_TOKEN_HEADER])
+          access_token: (params[ACCESS_TOKEN_PARAM] || env[ACCESS_TOKEN_HEADER]),
+          private_token: (params[PRIVATE_TOKEN_PARAM] || env[PRIVATE_TOKEN_HEADER]),
         }
-        UserSession.new.authenticate(options)
+        UserSession.new.authenticate(options.compact)
       end
     end