feat(nestjs): migrate to NestJS

packages/server/src/common/config/signup-restrictions.ts

@@ -0,0 +1,11 @@
+import { castCommaListEnvVarToArray } from '@/utils/cast-comma-list-envvar-Array';
+import { parseBoolean } from '@/utils/parse-boolean';
+import { registerAs } from '@nestjs/config';
+
+export default registerAs('signupRestrictions', () => ({
+  disabled: parseBoolean<boolean>(process.env.SIGNUP_DISABLED, false),
+  allowedDomains: castCommaListEnvVarToArray(
+    process.env.SIGNUP_ALLOWED_DOMAINS,
+  ),
+  allowedEmails: castCommaListEnvVarToArray(process.env.SIGNUP_ALLOWED_EMAILS),
+}));