title: How to set up signingConfigs only for release variants?
body: <p>I've set up continuous deployment with fastlane that handles my code signing for release apps, annoying bit is that when I run them in debug in on my machine android studio fails because it can't find path to them (they are declared as env variables demonstrated below). I can fix this by creating dummy data for the env variables, but would rather android studio ignore this bit of code unless it is running a release buid.</p>
  
  <p>So in my <code>app/build.gradle</code> right after <code>defaultConfig</code> I have</p>
  
  <pre><code>signingConfigs {
      release {
          storeFile file(System.getenv("MYAPP_STOREFILE"))
          storePassword System.getenv("MYAPP_STORE_PASSWORD")
          keyAlias System.getenv("MYAPP_KEY_ALIAS")
          keyPassword System.getenv("MYAPP_KEY_PASSWORD")
      }
  }
  </code></pre>
  
  <p>I thought that putting it under <code>release</code> would do the trick, but no luck :/</p>