title: Read environment variable in SpringBoot
body: <p>What is the best way to read <strong>environment variables</strong> in <strong>SpringBoot</strong>?<br>
  In Java I did it using:</p>
  
  <pre><code>String foo = System.getenv("bar");
  </code></pre>
  
  <p>Is it possible to do it using <code>@Value</code> annotation?</p>