Merge pull request #2290 from kaczmarj/tst/fix-circle

TST+FIX: do not save empty tar.gz file + use fastest gzip compression

Author: mgxd

.circleci/config.yml

@@ -137,17 +137,13 @@ jobs:
               docker save nipype/nipype:base \
                           nipype/nipype:latest \
                           nipype/nipype:py36 \
-                          nipype/nipype:py27 | gzip -6 > /tmp/docker/nipype-base-latest-py36-py27.tar.gz
+                          nipype/nipype:py27 | gzip -1 > /tmp/docker/nipype-base-latest-py36-py27.tar.gz
               du -h /tmp/docker/nipype-base-latest-py36-py27.tar.gz
-            else
-              # Workaround for `persist_to_workspace` to succeed when we are
-              # not deploying Docker images.
-              touch /tmp/docker/nipype-base-latest-py36-py27.tar.gz
             fi
       - persist_to_workspace:
           root: /tmp
           paths:
-            - docker/nipype-base-latest-py36-py27.tar.gz
+            - docker/*
 
 
   deploy: