CI cleanup
Sync CI with the QuaLiKiz CI. The GitLab YAMLs (which use a subset of YAML) are fully YAML compatible now. This is a sister MR to QuaLiKiz!100 (merged).
- JET CI passes: https://git.ccfe.ac.uk/kplass/QuaLiKiz/-/pipelines/95656
- QLK CI passes: https://gitlab.com/qualikiz-group/QuaLiKiz/-/pipelines/535303226
Edited by Karel van de Plassche