add getuserId cloud function, fix add signer err and change in start command

apps/OpenSignServer/cloud/parsefunction/getUserId.js

@@ -0,0 +1,18 @@
+async function getUserId(request) {
+  try {
+    const username = request.params.username;
+    const email = request.params.email;
+    const query = new Parse.Query(Parse.User);
+    if (username) {
+      query.equalTo('username', username);
+    } else {
+      query.equalTo('email', email);
+    }
+    const user = await query.first({ useMasterKey: true });
+    return { id: user.id };
+  } catch (err) {
+    console.log('err', err);
+    return err;
+  }
+}
+export default getUserId;