Build trigger was set up something about 2 years ago using
quay.io web ui (manually adding repo to build from).
After looking at some repos and github repo configs looks like lot of deployment keys were removed, thus it causes
quay.io builds to fail.
I believe there should be a better message why build fails (because of incorrect deployment key) - while right now there is nothing in the UI that shows that issue, the job is just retried and sometimes triggers are disabled if they fail too often.
I've disabled old trigger and added new trigger (which also added new deployment key to github repo), and looks like it works now.
Thanks for help.