Update .travis.yml

.travis.yml

@@ -14,18 +14,17 @@ notifications:
 services:
 - docker
 
-before_cache:
-  - >
-    mkdir -p $HOME/docker && docker images -a --filter='dangling=false' --format '{{.Repository}}:{{.Tag}} {{.ID}}'
-    | xargs -n 2 -t sh -c 'test -e $HOME/docker/$1.tar.gz || docker save $0 | gzip -2 > $HOME/docker/$1.tar.gz'
-  
 cache:
-  bundler: true
   directories:
-    - $HOME/docker
+  - docker_images
+
+before_install:
+- docker load -i docker_images/images.tar || true
+
+before_cache:
+- docker save -o docker_images/images.tar $(docker images -a -q)
 
 before_install:
-- if [[ -d $HOME/docker ]]; then ls $HOME/docker/*.tar.gz | xargs -I {file} sh -c "zcat {file} | docker load"; fi
 - composer update --ignore-platform-reqs --optimize-autoloader --no-plugins --no-scripts
 - sudo service mysql stop