fix(CircleCI): add --cache-from to docker build (amends #471)

Author: oesteban

.circleci/config.yml

@@ -77,7 +77,7 @@ jobs:
           no_output_timeout: 60m
           command: |
             e=1 && for i in {1..5}; do
-              docker build --rm \
+              docker build --rm --cache-from=niworkflows:latest \
                 -t niworkflows:latest \
                 --build-arg BUILD_DATE=`date -u +"%Y-%m-%dT%H:%M:%SZ"` \
                 --build-arg VCS_REF=`git rev-parse --short HEAD` . \