title: vscode passing environment var to args on launch.json
body: <p>I've created task (tasks.json) for setting environment variable as below</p>
  
  <pre><code>export SOME_IP_VARIABLE=1.2.3.4
  </code></pre>
  
  <p>my application needs IP parameters so I added args in launch.json as below</p>
  
  <pre><code>...
  "configuration":[
      ...
      "args":[
          "${env:SOME_IP_VARIABLE}
      ]
  ...
  </code></pre>
  
  <p>When I print argv value in the application, this prints nothing.</p>
  
  <p>Did I miss something? </p>