title: How to read a value in dockerfile during run-time
body: <p>I am having a use-case in which i am storing two arguments in openshift config map as below -</p>
  <pre><code>DT_URL=&quot;https://www.something.com&quot;
  DT_TOKEN=&quot;1234ABCD&quot;
  </code></pre>
  <p>Now i want these values to be fetched during run-time using jenkins. In my dockerfile i have arguments as below-</p>
  <pre><code>ARG URL=${DT_URL}
  ARG TOKEN=${DT_TOKEN}
  </code></pre>
  <p>Unfortunately i am not getting any values fetched. I would appreciate any help.</p>