fix: adjust LANGFLOW_CONFIG_DIR to prevent permission error

[italojohnny]

Fix permission issue and update docker-compose.yml

• Adjusted LANGFLOW_CONFIG_DIR to prevent permission errors
• Removed version field for Docker Compose v2 compatibility
• Replaced expose with ports for better configuration consistency
• Removed trailing whitespace for cleaner formatting

Fixes: #6008

[ogabrielluiz]

Why make this change? Expose is safer, isn't it?

[italojohnny]

This is a great question that brings up an important point about the philosophy behind Langflow. Expose is indeed "safer" in the sense that it restricts access to Docker's internal network, preventing accidental exposure. However, it also creates an additional hurdle for users who want to access Langflow from other machines on the network.

At the end of the day, this decision reflects a common trade-off in software design: should we prioritize restrictions to prevent misuse, or should we prioritize ease of use and trust the user to take responsibility?

Personally, as a user, I’d prefer something that works out of the box without extra configuration. With that in mind, I took the liberty of simplifying things a little here.