Add ZopFli Compression To Android Release APKs

zopfli_compression_notes.txt

// Apply ZopFli compression to an APK at the command-line

zipalign -z 4 infile.apk outfile.apk

// Add the following to your build.gradle

//add zopfli to variants with release build type
android.applicationVariants.all { variant ->
    if (variant.buildType.name == 'release') {
        variant.outputs.each { output ->
            output.assemble.doLast {
                println "Zopflifying... it might take a while"
                exec {
                    commandLine output.zipAlign.zipAlignExe,'-f','-z', '4', output.outputFile.absolutePath , output.outputFile.absolutePath.replaceAll('\\.apk$', '-zopfli.apk')
                }
            }
        }
    }
}

So if I want to add this progress to my CI server, I should install zipalign on my CI server?