Copy and rename mapping.txt file if minify is enable

android-mapping-file.gradle

android {
    applicationVariants.all { variant ->
        def versionCode = android.defaultConfig.versionCode
        def versionName = android.defaultConfig.versionName
        def appendToFileName = versionName + "-build-" + versionCode
        
        // copy and rename mapping.txt file if in minify is enable
        if (variant.getBuildType().isMinifyEnabled()) {
            variant.assemble.doLast{
                copy {
                    from variant.mappingFile
                    into "${rootDir}/mappings"
                    rename { String fileName ->
                        "mapping-${variant.name}-${appendToFileName}.txt"
                    }
                }
            }
        }
    }
}