Caching Docker Base Image in CircleCI

Build Environment Caching Dependencies
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We are in the same boat; speeding up builds by caching the env is a tradeoff with larger image sizes.

Status: Downloaded newer image ...
  pull stats: download 2.226GiB in 26.833s (84.94MiB/s), extract 2.225GiB in 2m46.246s (13.71MiB/s)
  time to create container: 510ms
...

Perhaps the upcoming pull rate limits in Docker Hub will encourage CI services to cache image layers.

You’d think local caching would be cheaper than CPU time + inbound bandwidth, saving us :timer_clock: & :moneybag:.