Support changing LLM tool Deployment name via environment variables for better parameterisation

[graemefoster]

I want to build a Prompt Flow into a docker container and re-use it in different environments. But for organisational reasons the deployment-names on my Azure Open AI deployments are not the same. Currently in Prompt flow, the deployment-name is not part of an Azure Open AI connection (where it could be overridden)

Describe the solution you'd like I'd like to be able to change the deployment-name based on an environment variable. So, in the yaml, something like:

inputs: deployment_name: ${environment.some_variable}

Describe alternatives you've considered Custom tools, but I'd like to use the built-in tools. Providing deployment name as a parameter... I don't want the user to be able to set this. It should be contextual to the deployment.

Additional context I've had a good look through the documentation. This file suggests it might be possible, but no example is given that changes the deployment-name: https://microsoft.github.io/promptflow/tutorials/run-management.html - "Sometime you want to switch connection or deployment name inside a flow when submitting it". The example only shows changing a connection. The deployment name is not part of the connection object.

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