fix: adjust LANGFLOW_CONFIG_DIR to prevent permission error (#6095)

* fix: adjust LANGFLOW_CONFIG_DIR to prevent permission error

* chore: remove version from docker-compose.yml

* style: remove trailing whitespace

* refactor: replace expose with ports

docker_example/docker-compose.yml

@@ -1,8 +1,6 @@
-version: "3.8"
-
 services:
   langflow:
-    image: langflowai/langflow:latest # or another version tag on https://hub.docker.com/r/langflowai/langflow 
+    image: langflowai/langflow:latest # or another version tag on https://hub.docker.com/r/langflowai/langflow
     pull_policy: always               # set to 'always' when using 'latest' image
     ports:
       - "7860:7860"
@@ -11,7 +9,7 @@ services:
     environment:
       - LANGFLOW_DATABASE_URL=postgresql://langflow:langflow@postgres:5432/langflow
       # This variable defines where the logs, file storage, monitor data and secret keys are stored.
-      - LANGFLOW_CONFIG_DIR=/app/langflow
+      - LANGFLOW_CONFIG_DIR=app/langflow
     volumes:
       - langflow-data:/app/langflow
 
@@ -21,8 +19,8 @@ services:
       POSTGRES_USER: langflow
       POSTGRES_PASSWORD: langflow
       POSTGRES_DB: langflow
-    expose:
-      - 5432
+    ports:
+      - "5432:5432"
     volumes:
       - langflow-postgres:/var/lib/postgresql/data