This template aims to make multi-stage container builds easier and more intuitive.

1. Add installation scripts to ./template/containerfiles/run
   • These should be .sh scripts
   • They should be written as if you were running them through the command line
2. Open ./template/engine_instructions.yaml in a text editor
3. Specify the base image for the container as the value for the base key
   • The image needs to be specified as a full container registry URL if the image is stored in a private registry
   • If the image is stored on DockerHub, a resolvable image name is sufficient
4. Under the images key, list the names of the install scripts
   • base name only, no extensions
   • each name should be a yaml array element
   • these will be intermediate images in the build
5. Values in the instructions key provide further modifications for the container
   • these are all optional
   • ENV
     • environment variables to set in the container
     • specify each variable as an array element with two keys:
       • name = variable name
       • value = variable value
   • COPY
     • files and directories to copy to the container
     • ./src is provided for your convenience, but any file under the repo root can be copied
     • specify each variable as an array element with two keys:
       • src = path from repo root
       • dst = path in container
   • ENTRYPOINT
     • allows the container to be run as an executable
     • default value is /bin/bash -c
     • each space-delimited value should be a separate yaml array element
   • CMD
     • commands/parameters passed to the entrypoint
     • each space-delimited value should be a separate yaml array element
6. To push your container image to a container registry, include values in the keys under tagging
   • registry = the URL of the container registry to push to
   • name = what to name the stored image
   • tag = optional (defaults to latest)
7. From ./template run make