title: How can I schedule a build job on buildkite with block and fields parameter
body: <p>I have a build pipeline defined in buildkite as below:</p>
  
  <pre><code>- block: ":terraform: benchmark?"
      fields:
      - text: "name"
        key: "name"
        required: false
        default: "10"
  </code></pre>
  
  <p>It has a block which means it requires developers to unblock the step manually. Also it set a field used in the build step which means developers who unblock the step need to type in a value for the <code>name</code>. I wonder how I can schedule this job to let it run periodically? How can I make the scheduler unblocks the step and give a predefined value for <code>name</code> field?</p>