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add local.properties file in /android folder
sdk.dir = /Users/nameHere/Library/Android/sdk
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add keystore.properties file in /android folder
storeFile=release-key.keystore keyAlias=release-key-alias storePassword=*** keyPassword=***
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generate .keystore file and place it under /android/app folder
sudo keytool -genkey -v -keystore release-key.keystore -alias release-key-alias -keyalg RSA -keysize 2048 -validity 10000
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run command
cd android && ./gradlew assembleRelease