[SSSD] [sssd PR#892][comment] ci: enable on demand runs and other improvements

[pbrezina]

  URL: https://github.com/SSSD/sssd/pull/892
Title: #892: ci: enable on demand runs and other improvements

pbrezina commented:
"""
* `master`
    * 6baf291ba2bd5f873b8e5e84e98d9cd251a5b2a3 - ci: convert to scripted pipeline
    * 73bd961c783594944d34eaa68f382901c0ff01be - ci: notify that build awaits executor
    * 46754e5465fdb4256e24c8ce588c5b47aded23cf - ci: set build name to pull request or
branch name
    * 89b256dfe506c6d448edc8c9a90f303879daa500 - ci: enable on demand runs
* `sssd-1-16`
    * 3a4d13c2759c90bb3c263595ce113748c0cd542e - ci: convert to scripted pipeline
    * 7374ac4d61660da86ba31633b73e36ef71b4e740 - ci: notify that build awaits executor
    * 1f6fdb98e7d9c9948aa174fa872796733210ae67 - ci: set build name to pull request or
branch name
    * fc0be68fc638248c56d77e57efdffb3f19f544c6 - ci: enable on demand runs

"""

See the full comment at https://github.com/SSSD/sssd/pull/892#issuecomment-540426110