Feature: gitlab service widget (#4317)

Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

src/utils/proxy/handlers/credentialed.js

@@ -94,6 +94,8 @@ export default async function credentialedProxyHandler(req, res, map) {
         }
       } else if (widget.type === "wgeasy") {
         headers.Authorization = widget.password;
+      } else if (widget.type === "gitlab") {
+        headers["PRIVATE-TOKEN"] = widget.key;
       } else {
         headers["X-API-Key"] = `${widget.key}`;
       }