Gradle task for building docker image

//generates image like this: $project.group/applicationName:tagVersion
task image(type: Docker, dependsOn: build ) {
    project.group = '' //this prevents the generated image from having the group value added. Personal preference to do this
    applicationName = "yourapp" 
    dockerfile = file('Dockerfile')
    tagVersion = 'latest'
    doFirst {
        copy {
            from jar
            into "${stageDir}/target"
        }
    }
}