Model serving with custom pip index URL

[ScyLukb]

An mlflow model was logged with a custom pip requirements file which contains package versions (mlflow==2.11.3), as well as a custom --index-url. 

However model serving during the "Initializing model enviroment" step tries to pip install mlflow==2.2.2

How can this be avoided and only install the package versions provided in the requirements file and with the provided index url?