chore: add deprecation notice for oidc user file

app/server/config/schema.ts

@@ -91,7 +91,7 @@ const partialOidcConfig = type({
 	token_endpoint_auth_method:
 		'"client_secret_basic" | "client_secret_post" | "client_secret_jwt"?',
 	redirect_uri: 'string.url?',
-	user_storage_file: 'string = "/var/lib/headplane/users.json"',
+	user_storage_file: 'string?',
 	disable_api_key_login: stringToBool.optional(),
 	headscale_api_key: 'string?',
 	headscale_api_key_path: 'string?',

app/server/web/sessions.ts

@@ -221,6 +221,23 @@ async function migrateUserDatabase(path: string, db: LibSQLDatabase) {
 	log.info('config', 'Migrating old user database from %s', path);
 	const realPath = resolve(path);
 
+	log.warn(
+		'config',
+		'oidc.user_storage_file is deprecated and will be removed in Headplane 0.7.0',
+	);
+	log.warn(
+		'config',
+		'You can ignore this warning if you do not use OIDC authentication.',
+	);
+	log.warn(
+		'config',
+		'Data will be automatically migrated to the new SQL database.',
+	);
+	log.warn(
+		'config',
+		'Refer to server.data_path to ensure this path is mounted correctly is using Docker.',
+	);
+
 	try {
 		const handle = await open(realPath, 'a+');
 		await handle.close();