Enables sandbox on about window

ts/context/environment.ts

@@ -0,0 +1,15 @@
+// Copyright 2023 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { config } from './config';
+import {
+  getEnvironment,
+  parseEnvironment,
+  setEnvironment,
+} from '../environment';
+
+setEnvironment(parseEnvironment(config.environment));
+
+const environment = getEnvironment();
+
+export { environment };