signing.gradle

def propertiesFilename = "production.properties"
if (!project.file(propertiesFilename).exists()) {
    propertiesFilename = "contributors.properties"
}

def signingProperties = new Properties()
signingProperties.load(new FileInputStream(file(propertiesFilename)))

android {
    signingConfigs {
        release {
            keyAlias signingProperties.releaseSignKeyAlias
            keyPassword signingProperties.releaseSignKeyPassword
            storeFile file(signingProperties.releaseStoreFilePath)
            storePassword signingProperties.releaseStorePassword
        }
    }
}