feat: runtime env

Support runtime environment variables using server components.

This will mean docker images can change env vars for runtime as required.

packages/lib/constants/app.ts

@@ -1,3 +1,5 @@
+import { getRuntimeEnv } from '../universal/runtime-env/get-runtime-env';
+
 export const IS_APP_MARKETING = process.env.NEXT_PUBLIC_PROJECT === 'marketing';
 export const IS_APP_WEB = process.env.NEXT_PUBLIC_PROJECT === 'web';
 
@@ -6,3 +8,21 @@ export const APP_FOLDER = IS_APP_MARKETING ? 'marketing' : 'web';
 export const APP_BASE_URL = IS_APP_WEB
   ? process.env.NEXT_PUBLIC_WEBAPP_URL
   : process.env.NEXT_PUBLIC_MARKETING_URL;
+
+export const appBaseUrl = () => {
+  const { NEXT_PUBLIC_WEBAPP_URL, NEXT_PUBLIC_MARKETING_URL } = getRuntimeEnv();
+
+  if (IS_APP_WEB) {
+    return NEXT_PUBLIC_WEBAPP_URL;
+  }
+
+  if (IS_APP_MARKETING) {
+    return NEXT_PUBLIC_MARKETING_URL;
+  }
+
+  if (typeof window !== 'undefined') {
+    return window.location.origin;
+  }
+
+  return NEXT_PUBLIC_WEBAPP_URL ?? 'http://localhost:3000';
+};