Have a save image on FS feature

Just to have some context because saving an docker image is not really common, my use case was to build a docker image on a CI an deliver it as a binary instead of pushing it to a docker repository.

Since i needed it fast I made my plugin as mentioned before. I don't know if some things can be taken from that but in case here is the link followed by some highlights: https://github.com/baptistemesta/docker-build

The part that were important for me was a minimal configuration of the project using the plugin. Here is a sample configuration:

apply plugin: 'distribution'
apply plugin: 'docker-build'

group = "com.myproject"
version = "1.0.0-SNAPSHOT"

docker {
    serverUrl = System.getProperty("docker.url")
    saveImageTo = new File(buildDir, "docker-image.tar")
}
distributions {
    main {
        contents {
            from { docker.saveImageTo }
        }
    }
}
tasks.distZip.dependsOn(tasks.buildDockerImage)

and to build the image you just have to run on the project

locally gradle distZip or with a remote docker gradle distZip -Ddocker.url=DOCKER_URL

I don't know if something like this can be also done in this plugin since it was more oriented on creating a docker image to run

Transmode / gradle-docker

Have a save image on FS feature #76