Sweeping !1047 from master to devel: [master]Docs: add HowTo (!1051) · Merge requests · LHCb Dirac / LHCbDIRAC · GitLab

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LHCbDIRAC Bot requested to merge cherry-pick-ff0077922-devel into devel Jul 20, 2021

No need for release notes, just add a HowTo doc