Image Build
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* img: https://github.com/genuinetools/img
* buildah: https://github.com/containers/buildah
* kaniko: https://github.com/GoogleContainerTools/kaniko
    * run as an image, using: gcr.io/kaniko-project/executor

* the next-generation docker build: https://github.com/moby/buildkit
  

* Source-To-Image (S2I): https://github.com/openshift/source-to-image
    * directly from source code without Dockerfile
* Jib: https://github.com/GoogleContainerTools/jib
    * specifically for building Java images
    * It includes Maven and Gradle plugins
* Bazel: https://github.com/bazelbuild/bazel