hi all, i have Pulumi provider to manage some resources. that services has both API and Pulumi Provider. now my application code needs to make changes to the resources. is there a way to call some Pulumi API such that, the changes first stored in Git (as source of truth), then get applied by Pulumi?

The common pattern is to make anything you want to change externally configurable through the stack configuration, which you can modify through your application code. If you explain in a bit more detail what you're trying to achieve overall, chances are you'll find someone who has solved a similar problem before.