Pablo Carranza Velez acf3771ea8 automation: Always try to cache using the latest master build
This change makes us always try to use the latest master builds of the intermediate images
for the --cache-from option in our docker build of the supervisor.

This prevents cache misses when we're rebasing a branch and a PR has been merged that modifies a component that we're not modifying
in the current branch.
For example:
Branch 1 modifies the base image. Branch 2 only modifies the nodejs code. Branch 1 gets merged before Branch 2, so in our Branch2 PR we
rebase from master - in the next build for Branch 2, we'll have a cache miss on the base image, unless we're using the last master for caching.

Change-Type: patch
Signed-off-by: Pablo Carranza Velez <pablo@resin.io>
2017-11-01 18:15:33 -07:00
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