Docs: follow on for database service config change

[mendonk]

Follow-on PR to #5960

This pull request includes updates to the docs/docs/Configuration/environment-variables.md file to expand and clarify the documentation on supported environment variables for Langflow. The changes include updates to existing entries and the addition of new environment variables.

Documentation Updates:

• Added default values and descriptions for LANGFLOW_CONFIG_DIR and LANGFLOW_DATABASE_URL.
• Introduced new environment variables such as LANGFLOW_DATABASE_CONNECTION_RETRY, LANGFLOW_DB_POOL_SIZE, LANGFLOW_DB_MAX_OVERFLOW, LANGFLOW_DB_CONNECT_TIMEOUT, and LANGFLOW_DB_CONNECTION_SETTINGS.
• Updated the LANGFLOW_OPEN_BROWSER default value and added new variables like LANGFLOW_MCP_SERVER_ENABLED, LANGFLOW_MCP_SERVER_ENABLE_PROGRESS_NOTIFICATIONS, and LANGFLOW_NEW_USER_IS_ACTIVE.
• Added LANGFLOW_SECRET_KEY for encrypting sensitive data and updated defaults for LANGFLOW_SUPERUSER and LANGFLOW_SUPERUSER_PASSWORD.
• Removed redundant entries and clarified the log environment variables.

[ebachUTSA]

The online docs (https://docs.langflow.org/environment-variables) do not provide sufficient information on LANGFLOW_DB_CONNECTION_SETTINGS options (and many other ENV variables). Is there a more updated and comprehensive resource (other than looking at the code, which is what we are currently doing)?

[mendonk]

@ebachUTSA Thanks for your feedback! I've added issue #6130 to address this.

[ebachUTSA]

@ebachUTSA Thanks for your feedback! I've added issue #6130 to address this.

Thank you! My team usually handles putting in tickets/issues on Github for me (not a strength of mine). We are trying to be increasingly proactive for the community and Langflow team.