Fix: consistently check allowed domains (#2985)

* fix: ensure consistency of checking allowed domain

* chore: update comment to match the logic

server/commands/teamCreator.ts

@@ -1,7 +1,7 @@
 import invariant from "invariant";
 import Logger from "@server/logging/logger";
 import { Team, AuthenticationProvider } from "@server/models";
-import { getAllowedDomains } from "@server/utils/authentication";
+import { isDomainAllowed } from "@server/utils/authentication";
 import { generateAvatarUrl } from "@server/utils/avatars";
 import { MaximumTeamsError } from "../errors";
 
@@ -57,9 +57,9 @@ export default async function teamCreator({
     const teamCount = await Team.count();
 
     // If the self-hosted installation has a single team and the domain for the
-    // new team matches one in the allowed domains env variable then assign the
-    // authentication provider to the existing team
-    if (teamCount === 1 && domain && getAllowedDomains().includes(domain)) {
+    // new team is allowed then assign the authentication provider to the
+    // existing team
+    if (teamCount === 1 && domain && isDomainAllowed(domain)) {
       const team = await Team.findOne();
       invariant(team, "Team should exist");