build.gradle

    applicationVariants.all { variant ->
        if (variant.buildType.name == 'release') {
            variant.outputs.each { output ->
                def outputFile = output.outputFile
                if (outputFile != null && outputFile.name.endsWith('.apk') && output.zipAlign) {
                    def fileName = "ezbuy_V${defaultConfig.versionName}_${new Date().format("yyyy-MM-dd", TimeZone.getTimeZone("UTC"))}_signature.apk"
                    output.outputFile = new File(outputFile.parent, fileName)
                }
            }
        } else { // buildType -> debug
            def buildNumber = System.getenv("BUILD_NUMBER")
            def jenkinsBuild = buildNumber != null ? buildNumber : "0"

            if (jenkinsBuild != '0') {
                variant.outputs.each { output ->
                    def outputFile = output.outputFile
                    if (outputFile != null && outputFile.name.endsWith('.apk') && output.zipAlign) {
                        def fileName = "ezbuy-v${defaultConfig.versionName}-${variant.buildType.name}-jenkins-${jenkinsBuild}.apk"
                        output.outputFile = new File(outputFile.parent, fileName)
                    }
                }
            }
        }
    }