feat: restrict non credential provider interactions (#871)

* wip: add provider field to sqlite user table

* feat: disable invites when credentials provider is not used

* wip: add migration for provider field in user table with sqlite

* wip: remove fields that can not be modified by non credential users

* wip: make username, mail and avatar disabled instead of hidden

* wip: external users membership of group cannot be managed manually

* feat: add alerts to inform about disabled fields and managing group members

* wip: add mysql migration for provider on user table

* chore: fix format issues

* chore: address pull request feedback

* fix: build issue

* fix: deepsource issues

* fix: tests not working

* feat: restrict login to specific auth providers

* chore: address pull request feedback

* fix: deepsource issue

packages/auth/providers/check-provider.ts

@@ -0,0 +1,9 @@
+import type { SupportedAuthProvider } from "@homarr/definitions";
+
+import { env } from "../env.mjs";
+
+export const isProviderEnabled = (provider: SupportedAuthProvider) => {
+  // The question mark is placed there because isProviderEnabled is called during static build of about page
+  // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+  return env.AUTH_PROVIDERS?.includes(provider);
+};