internal/ci: allow gerritHubHostname to be overridden
This will allow us to experiment with an alternative GerritHub host in
other repos that depend on this internal/ci CUE module.
Signed-off-by: Paul Jolly <paul@myitcv.io>
Change-Id: I692f4416b98b4743941199f6068d9106a7443c5b
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1218940
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>