Additional fields for runners and workflows

[r-savcenko]

This PR adds possibility to expose additional metric for

• Workflow
  • created_at - Time workflow was create
  • updated_at - Time workflow was modified
  • conclusion - In addition to status indicates if workflow succeeded or failed
• Enterprise runners
  • status - Indicates if runner is currently busy or idle

Additionally id field was removed from github_runner_enterprise_status as it is irrelevant for metrics

[roshvin]

Hi @r-savcenko

could you pls suggest on below topic
is this exporter support to get matrix from enterprise default runner in GHE .
we have installed it and its not showing anything on pod log . or if we are missing something.
could you pls suggest.

k logs -f action-export-github-actions-exporter-7ccfcd957-v8xzr
2022/08/15 17:13:32 authenticating with Github Token
2022/08/15 17:13:32 exporter listening on 0.0.0.0:9999