Triggering a Harbourmaster build on a given commit

[Dr. ERDI Gergo]

Hi,

Given a concrete commit on a non-master branch (e.g. 
https://phabricator.haskell.org/rGHC20acaa7785d910d36d46c4eae9e9cce4000635d1),
how do I manually trigger a Harbourmaster build + validation?

Thanks,
 	Gergo

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