Template pre-processing of the makefile about dockermake HOT 2 OPEN

Thanks for your comments and issues, @epcim! I agree that would definitely be great to have methods for additional parameterization within the docker-makefile.

For my personal use cases, docker build-args have gone a long way towards addressing this need. Jinja is a little out of scope for my conception of this tool - if I personally needed this functionality, I'd likely just use a separate Jinja CLI tool to generate DockerMake.yml, rather than building templating into docker-make.

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I think so finally, jinja2 is out of scope. For anything other, I found pyInvoke (python kind of Makefile) can do the remaining magic quite well. https://github.com/epcim/docker-salt-formulas/blob/master/tasks.py

What I would like to see anyway is "args" to tasks names and have them available in FROM. Simply as python Template formatting stuff, not the jinja. I know it may pain for "keys" but it's doable.

# --build-arg os_codename=stretch

debian-${os_codename}:
  FROM: debian:${os_codename}

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