https://docs.microsoft.com/en-us/azure/databricks/dev-tools/ci-cd/ci-cd-azure-devops

You don´t have to follow the whole CI/CD procedure. You could f.e. opt for only code promotion to QA/PRD using git + Databricks Repos.

In a small team this could even be done manually (commits using Repos on git and pull requests).

So basically git + Repos is the way.