link front page cloud button to portal landing page

Review here

services/overall/learning-materials.md

@@ -38,6 +38,15 @@ If you find issues or would like to contribute, feel free to take a look at the
 [python-pandas-material]: {{ "workshop-materials/python-pandas/" | relative_url }}
 [python-pandas-repo]: https://gitlab.hzdr.de/hifis/software/education/hifis-workshops/workshop-pandas
 
+### GitLab
+
+| Topic                                 | Materials                      | Repository                   |
+|---------------------------------------|--------------------------------|------------------------------|
+| Continuous Integration with GitLab CI | [Material][gitlab-ci-material] | [Repository][gitlab-ci-repo] |
+
+[gitlab-ci-material]: {{ "workshop-materials/gitlab-ci/" | relative_url }}
+[gitlab-ci-repo]: https://gitlab.hzdr.de/hifis/software/education/hifis-workshops/gitlab-ci/workshop-materials
+
 ### Further Materials
 
 Not all of our workshop materials are published in a nice fashion (yet).