feat: add env variable to disable update check

frontend/src/routes/settings/+layout.server.ts

@@ -1,3 +1,5 @@
+import { version as currentVersion } from '$app/environment';
+import { env } from '$env/dynamic/private';
 import AppConfigService from '$lib/services/app-config-service';
 import type { AppVersionInformation } from '$lib/types/application-configuration';
 import type { LayoutServerLoad } from './$types';
@@ -6,6 +8,14 @@ let versionInformation: AppVersionInformation;
 let versionInformationLastUpdated: number;
 
 export const load: LayoutServerLoad = async () => {
+	if (env.UPDATE_CHECK_DISABLED === 'true') {
+		return {
+			versionInformation: {
+				currentVersion: currentVersion
+			} satisfies AppVersionInformation
+		};
+	}
+
 	const appConfigService = new AppConfigService();
 
 	// Cache the version information for 3 hours