Use keyword extends in gitlab-ci

Simon Praetoriusrequested to merge
feature/use-rule-extension into master

Summary

Due to a change in the master template, we can now inherit all properties in the gitlab-ci file from a common (hidden) job .common. This was a yml template before that your not be used when the template file is included. The extends keyword can be used in this situation. All job properties from .common are merged into the new job definition.

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