This post is how to get a secret from a key vault in Databricks.
First you need to setup dbutils.
Next you have to make sure your Databricks installation has a Key Vault integrated Scope setup.
Then you need to make sure that Databricks is allowed to communicate with your KeyVault.
Then you can query your Key Vault to get the secret with the following command.
secret = dbutils.secrets.get(scope='<SCOPE>', key='<SECRET_KEY>')