Authorize powershell script to access devops repo through managed identity or any automated way?

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PowerShell

Azure

script

Is it possible to access devops repo within powershell script using managed identity without any manual steps like interactive login (this has to run automatically as azure function)?

The goal is to attach a master branch to appservice but this has to be done within the script while creating appservice. But what about having this automated? How can I authorize the script to attach master branch for CI deployments using managed identity or something else if not possible?

What I have tried:

Manual appservice setup through azure portal or through the script with interactive login works fine of course.