simplify

.devcontainer/base/docker-compose.yaml

@@ -2,9 +2,9 @@ services:
 
   devcontainer:
     container_name: devcontainer
+    image: "zitadel-devcontainer-base:local"
     build:
-      context: ../..
-      dockerfile: .devcontainer/base/Dockerfile
+      context: ../base
     volumes:
       - ../../:/workspaces:cached
     command: sleep infinity
@@ -12,8 +12,7 @@ services:
     environment:
       ZITADEL_DATABASE_POSTGRES_HOST: db
       ZITADEL_EXTERNALSECURE: false
-      DISPLAY: ' '
-      
+
   db:
     container_name: db
     image: postgres:17.0-alpine3.19