Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -15,7 +15,7 @@ image_build:
   before_script:
     - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN http://$CI_REGISTRY
   script:
-    - docker pull renku/singleuser:latest
+    - docker pull renku/singleuser:0.2.0
     - CI_COMMIT_SHA_7=$(echo $CI_COMMIT_SHA | cut -c1-7)
     - docker build --tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA_7 .
     - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA_7
@@ -24,7 +24,7 @@ image_build:
 
 dot:
   stage: build
-  image: renku/renku-python:latest
+  image: renku/renku-python:0.2.0
   script:
     - renku log --format dot $(git ls-files --no-empty-directory --recurse-submodules) > graph.dot
   artifacts: