Debug and release keystore

gistfile1.txt

signingConfigs {
    release {
        if (keystorePropertiesFile.exists()) {
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile file(keystoreProperties['storeFile'])
            storePassword keystoreProperties['storePassword']
        }
    }
}

buildTypes {
    release {
        if (keystorePropertiesFile.exists()) {
            signingConfig signingConfigs.release
            println "Signing with key.properties"
        } else {
            signingConfig signingConfigs.debug
            println "Signing with debug keys"
        }
    }
}