Merge branch 'ci' into 'master'

Update .gitlab-ci.yml

See merge request luis.salamanca/democrasci_preprocwp1!14

.gitlab-ci.yml

@@ -24,8 +24,10 @@ image_build:
 
 dot:
   stage: build
-  image: renku/singleuser:latest
+  image: renku/renku-python:latest
   script:
+    - echo $PATH
+    - renku --version
     - renku log --format dot $(git ls-files --no-empty-directory --recurse-submodules) > graph.dot
   artifacts:
     paths: