[SSSD] [sssd PR#919][opened] ci: improvements for on-demand builds

[pbrezina]

   URL: https://github.com/SSSD/sssd/pull/919
Author: pbrezina
 Title: #919: ci: improvements for on-demand builds
Action: opened

PR body:
"""
1. Logs are now correctly archived in Jenkins.
2. Internal `sssd-ci` tool now allows to issue build only for specific systems (`sssd-ci
build -s debian10 -s fedora-rawhide`)
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/919/head:pr919
git checkout pr919