Alpine docker image with openjdk and git and bash, ruby and other libraries required for the opinionated pipeline.
Follow the instructions starting from https://docs.docker.com/engine/getstarted/step_four/
$ docker build -t pipeline-base . --no-cache
$ docker images
// find the proper image e.g. 95610717ba45
// pick proper version e.g. 0.1.0
$ docker tag 95610717ba45 cloudpipelines/pipeline-base:0.1.0
$ docker tag 95610717ba45 cloudpipelines/pipeline-base:latest
$ docker login
$ docker push cloudpipelines/pipeline-base