feat(Makefile): set docker build flags via environment variable

deis / postgres

A PostgreSQL database used by Deis Workflow.

https://deis.com

MIT License

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Closed mboersma closed 7 years ago

mboersma commented 7 years ago

This allows CI jobs to set the "--pull --no-cache" flags in particular. The "--rm" flag was removed since it's the default.

See deis/jenkins-jobs#327.