title: Detox successfully builds but does not install app on Android emulator
body: <p>I'm getting a successful <code>detox build</code>, and the emulator starts up, but the app is just never installed.</p>
  <p><code>react-native run-android</code> (without Detox) works fine.</p>
  <p>The only error I'm seeing (including in verbose mode) is: &quot;No instrumentation runner found&quot;, but I'm guessing that just means Detox can't find the app (which was never installed).</p>
  <p>How can I get Detox to actually install the app onto the emulator?  The only clue I see is that the package name has <code>.test</code> appended in this case which may be an issue, but I'm not at all sure of that.</p>
  <p>(I tried to <code>adb install</code> the test app but that doesn't fix the issue, and also nothing shows up in the emulator when I run the command: <code>adb -e install android/app/build/outputs/apk/androidTest/debug/app-debug-androidTest.apk</code>.  This installation command works fine for our standard debug apk.)</p>
  <p>Log:</p>
  <pre><code>BUILD SUCCESSFUL in 25s
  1029 actionable tasks: 1 executed, 1028 up-to-date
  detox[66003] INFO:  [test.js] configuration=&quot;android.emu.debug&quot; reportSpecs=true readOnlyEmu=false useCustomLogger=true forceAdbInstall=false DETOX_START_TIMESTAMP=1597412615185 node_modules/.bin/jest --config e2e/config.json '--testNamePattern=^((?!:ios:).)*$' --maxWorkers 1 e2e
  detox[66004] INFO:  [DetoxServer.js] server listening on localhost:55217...
  detox[66004] ERROR: Error: No instrumentation runner found on device emulator-11448 for package com.myco.myapp.test
  detox[66004] INFO:  Example is assigned to undefined
  detox[66004] INFO:  Example: should have welcome screen
  detox[66004] INFO:  Example: should have welcome screen [SKIPPED]
  
  detox[66003] ERROR: [cli.js] Error: Command failed: node_modules/.bin/jest --config e2e/config.json '--testNamePattern=^((?!:ios:).)*$' --maxWorkers 1 e2e
  </code></pre>
  <p>detoxrc entry:</p>
  <pre><code>    &quot;android.emu.debug&quot;: {
        &quot;binaryPath&quot;: &quot;android/app/build/outputs/apk/androidTest/debug/app-debug-androidTest.apk&quot;,
        &quot;testBinaryPath&quot;: &quot;android/app/build/outputs/apk/androidTest/debug/app-debug-androidTest.apk&quot;,
        &quot;build&quot;: &quot;cd android &amp;&amp; ./gradlew assembleDebug assembleAndroidTest -DtestBuildType=debug &amp;&amp; cd ..&quot;,
        &quot;type&quot;: &quot;android.emulator&quot;,
        &quot;device&quot;: {
          &quot;avdName&quot;: &quot;Pixel_API_28_AOSP&quot;
        }
      },
  </code></pre>