Run Script once after Deployment

We have to update our Cosmos DB after we deploy a new version of our function app.

What is the recommended way to do this?

The database is not available from the Internet.
The solution should be as portable as possible, as we might switch to other Azure services.

The [appStart hook](https://learn.microsoft.com/en-us/azure/azure-functions/functions-reference-node?tabs=javascript%2Clinux%2Cazure-cli&pivots=nodejs-model-v4#app-hooks) seems wrongs since it would run multiple times and slow down API responses.

Using Kudu seems bad for multiple reasons:
- The repo has been archived and is no longer maintained
- No documentation on how to run something once on deployment. [This](https://github.com/projectkudu/kudu/wiki/Customizing-deployments) seems to be something else because we don't want to change the deployment itself. We want to run a migration afterwards.

Thanks for your time