Do not inject ARG on newer Docker versions.
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- Python
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Description
https://github.com/deis/dockerbuilder/pull/118/files/13b2463d5311da00ac5125534ee7add19a89fa3a#r108909997
I think it might be a good idea to not inject the ARGs in newer Docker versions. For me, each ARG statement takes about 2 seconds to run (Running on Azure). With a bunch of config vars defined, this extends the build time by minutes for me.
As an aside I do wonder why the ARG takes so long when running on my Deis install. Building the Dockerfile directly is super fast. Is this a disk-bound operation?
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