gitlab-runner "x509: certificate signed by unknown authority"

ERROR: Registering runner... failed                 runner=sohsMZnj status=couldn't execute POST against https://holyxlat.com:443/api/v4/runners: Post https://holyxlat.com:443/api/v4/runners: x509: certificate signed by unknown authority
PANIC: Failed to register this runner. Perhaps you are having network problems

[solution]
$ mkdir /etc/gitlab-runner/certs
$  cp /etc/gitlab/ssl/holyxlat.com.crt /etc/gitlab-runner/certs/.