Build ID can be omitted by setting excludeBuildFromContext in config
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my $contextTrailer = $conf->{excludeBuildFromContext} ? "" : (":" . $b->id);
my $body = encode_json(
{
state => $finished ? toGithubState($b->buildstatus) : "pending",
target_url => "$baseurl/build/" . $b->id,
description => "Hydra build #" . $b->id . " of $jobName",
context => "continuous-integration/hydra:" . $jobName . $contextTrailer
});