CI: Use bash instead of ash

Author: effigies

.circleci/config.yml

@@ -112,10 +112,10 @@ jobs:
           working_directory: /home/circleci/nipype/docker
           command: |
             mkdir -p /tmp/docker
-            ash ./generate_dockerfiles.sh -b
+            bash ./generate_dockerfiles.sh -b
 
             # Use the sha256 sum of the pruned Dockerfile as the cache key.
-            ash prune_dockerfile.sh Dockerfile.base > /tmp/docker/Dockerfile.base-pruned
+            bash prune_dockerfile.sh Dockerfile.base > /tmp/docker/Dockerfile.base-pruned
       - restore_cache:
           key: dockerfile-cache-v1-master-{{ checksum "/tmp/docker/Dockerfile.base-pruned" }}
       - run: