Save Docker image in /tmp

.circleci/config.yml

@@ -72,11 +72,11 @@ jobs:
       # required since Workflows do not have the same remote docker instance.
       - run:
           name: docker save app:build
-          command: mkdir -p /cache; docker save -o /cache/docker.tar "app:build"
+          command: mkdir -p /tmp; docker save -o /tmp/docker.tar "app:build"
       - save_cache:
           key: v1-{{ .Branch }}-{{epoch}}
           paths:
-            - /cache/docker.tar
+            - /tmp/docker.tar
 
   publish:
     docker:
@@ -87,7 +87,7 @@ jobs:
           key: v1-{{.Branch}}
       - run:
           name: Restore Docker image cache
-          command: docker load -i /cache/docker.tar
+          command: docker load -i /tmp/docker.tar
 
       - run:
           name: Deploy to Dockerhub