Assemble all distribution apks with filenames and copy the debug and release versions of each build flavor to an `apks` directory.

assembleDistribution.gradle

task copyApks(type: Copy) {
    ["debug", "release"].each { type ->
        from "build/outputs/apk/${type}/"
    }
    into "apks/all-${AppVersion.fullVersionCode}-${gitSha}"
    include '**/*.apk'
    rename { String filename ->
        filename.replace("app-", "").replace(".apk", "-${AppVersion.fullVersionCode}-${gitSha}.apk")
    }
}

task assembleDistribution(type: GradleBuild) {
    tasks = ['clean', 'assembleDebug', 'assembleRelease']
}