title: Missing environment variables when app is deployed to app engine
body: <p>I am new to node development struggling with getting the environment variables form the app engine . I am trying to deploy a web server to Google App engine.</p>
  
  <p>During development I am using the "dotenv" package to get the variables.Everything is working as expected.</p>
  
  <p>When deployed to engine using app.yaml. I am missing all the variables getting undefined.
  Currently I am using node 12.5.0 and using <code>runtime: nodejs12</code> in the app.yaml.</p>
  
  <pre><code>runtime: nodejs12
  env_variables:
    AccountID: "XXXXXXXXXXXXXX"
    Token: "somethingrandom"
  </code></pre>
  
  <p>.env </p>
  
  <pre><code>AccountID=myacccountID
  Token=mytoken
  </code></pre>
  
  <p>index.js</p>
  
  <pre><code>require("dotenv").config();
  
  let accountid = process.env.AccountID
  console.log(accountid);
  </code></pre>
  
  <p>on my local environment I am getting value correctly. 
  But on the GAE i'm getting undefined</p>
  
  <p>Previously I have even tried to include the .env file and  use the "dotenv" library in App engine and it worked. But it is not working now.</p>