Fix: fetching codegate env var logic

[teodor-yanev]

This is a fix for #1330

https://stackoverflow.com/a/65640689

Tested this locally

2025-04-01 23:17:16 Initializing entrypoint script...
2025-04-01 23:17:16 Backup path or mode not provided. Skipping restore.
2025-04-01 23:17:16 Generating certificates...
2025-04-01 23:17:18 /usr/local/lib/python3.12/site-packages/pydantic/_internal/_fields.py:192: UserWarning: Field name "schema" in "JsonSchema" shadows an attribute in parent "BaseModel"
2025-04-01 23:17:18   warnings.warn(
2025-04-01 23:17:18 Starting the dashboard...
2025-04-01 23:17:18 Starting the application with args: --port 8989 --host 0.0.0.0 --model-base-path /app/codegate_volume/models --db-path /app/codegate_volume/db/codegate.db --vec-db-path /app/sqlite_data/vectordb.db --ollama-url http://host.docker.internal:11434 --lm-studio-url http://host.docker.internal:1234 --log-level WARNING --log-format TEXT
2025-04-01 23:17:20 /usr/local/lib/python3.12/site-packages/pydantic/_internal/_fields.py:192: UserWarning: Field name "schema" in "JsonSchema" shadows an attribute in parent "BaseModel"
2025-04-01 23:17:20   warnings.warn(
2025-04-01 23:17:21 alembic
2025-04-01 23:17:21 is_dev_env: True
2025-04-01 23:17:21 Existing Certificates are already present.
2025-04-01 23:17:21 2025-04-01T20:17:21.687690Z [warning  ] A new version of CodeGate is available: v0.1.30 lineno=33 module=scheduled pathname=/app/src/codegate/updates/scheduled.py