CI: only fail docs jobs on sphinx runs

When the build is not there or not usable (e.g. the Moore branch relies on a Rec branch not yet in lhcb-head), fail with warnings. With this change, a failing pipeline should hopefully only happen when there is a real problem in the documentation.

added Build enhancement only GitLab CI labels

Example of a pipeline passing with warning (inconsistent nighty slot):

• https://gitlab.cern.ch/lhcb/Moore/-/pipelines/2494159
• in protected branch: https://gitlab.cern.ch/lhcb/Moore/-/pipelines/2494161

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• 6d68efb4 - CI: only fail docs jobs on sphinx runs

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• 9688ab89 - CI: only fail docs jobs on sphinx runs

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ready from my side

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• 68c69a19 - CI: only fail docs jobs on sphinx runs

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resolved all threads

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merged

mentioned in commit d76c3e4c

Excellent improvement, this was rather annoying. Thanks!

mentioned in issue #272 (closed)