how-to-build.md

@@ -69,3 +69,8 @@ yarn add --dev jest
 yarn global add jest
 jest --updateSnapshot
 ```
+For a release build, install keystore https://git.fairkom.net/chat/fairchat.ReactNative/issues/23 and run
+
+   ```bash
+    $ react-native run-android --variant=release
+    ```
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