trigger rebuild with newer timestamp.

.gitlab-ci.yml

@@ -14,4 +14,5 @@ build:
   script:
     - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN registry.gitlab.com
     - docker build -t registry.gitlab.com/yade-dev/docker-yade:ubuntu16.04-py3 .
-    - docker push registry.gitlab.com/yade-dev/docker-yade:ubuntu16.04-py3
\ No newline at end of file
+    - docker push registry.gitlab.com/yade-dev/docker-yade:ubuntu16.04-py3
+

Dockerfile

@@ -76,3 +76,4 @@ RUN apt-get autoclean && \
     apt-get autoremove && \
     rm -rf /var/lib/apt/lists/* && \
     rm -rf /var/cache/apt/archives/*deb
+