Michel Dänzer authored Mar 25, 2019 and Michel Dänzer committed Mar 25, 2019

This reverts commit 8694395f.

Some scenarios have come to light where this failed to ensure the docker
image exists:

* If the master branch of a forked repository is used for an MR which
  doesn't modify .gitlab-ci.yml, the docker-image job may not run.
* If the docker-image job of the first pipeline in a forked repository
  is cancelled or fails for any reason, and .gitlab-ci.yml isn't
  modified for the next pipeline run.
(Cherry picked from commit 0ec9a13c)