fix(web): build from monorepo context

apps/web/docker-compose.prod.yml

@@ -2,9 +2,9 @@ version: '3.8'
 
 services:
   web:
-    build:
-      context: .
-      dockerfile: Dockerfile
+    build:
+      context: ../..
+      dockerfile: apps/web/Dockerfile
       args:
         - NEXT_PUBLIC_POSTHOG_KEY=${NEXT_PUBLIC_POSTHOG_KEY}
         - NEXT_PUBLIC_POSTHOG_HOST=${NEXT_PUBLIC_POSTHOG_HOST:-https://eu.i.posthog.com}