gitea: enable push-to-create for new repositories

hosts/by-name/servo/services/gitea.nix

@@ -53,6 +53,8 @@
     session.COOKIE_SECURE = true;
     repository = {
       DEFAULT_BRANCH = "master";
+      ENABLE_PUSH_CREATE_USER = true;
+      ENABLE_PUSH_CREATE_ORG = true;
     };
     other = {
       SHOW_FOOTER_TEMPLATE_LOAD_TIME = false;