I just watched this great tutorial https://www.pulumi.com/resources/building-container-based-aws-lambda-functions-in-python/ And I noticed it uses a docker provider. Let's say I'll add a test before deployment with https://www.pulumi.com/registry/packages/docker/api-docs/container/ - does that mean I'm going to pay for a pulumi resource that is just run once give the current pay per resource pricing model?

Yes