title: Add username and password to a yaml config file with Azure Pipelines
body: <p>I am trying to deploy a prometheus exporter with Azure DevOps, however, the configuration has a username and a password which I wish to populate through the Azure Pipelines as I dont want to store the credentials in my repository. My YAML config looks like this:</p>
  
  <pre><code>version: 3
    max_repetitions: 25
    timeout: 10s
    auth:
      security_level: authPriv
      username: admin
      password: password123
  </code></pre>