Add Job to end of GitHub workflows to report failed workflow in Slack

[jadecarino]

Story

As a Galasa developer, I want to be notified if a GitHub Actions workflow fails, so I can diagnose the failure and provide a fix.

Background

The GitHub Actions workflows are currently missing a Job at the end which reports failed workflows into the galasa-devs Slack channel, similar to what the Tekton builds did.

Tasks

• Add new command to galasabld for failed workflows
• Add Job to the end of each workflow that only runs if any of the previous Jobs failed - this Job should have one step which uses the galasabld slackpost workflows command to post a message into galasa-devs
  • wrapping
  • gradle
  • maven
  • framework
  • extensions
  • managers
  • obr
  • cli
  • isolated
  • simplatform
  • helm
  • webui
  • buildutils
  • automation
• The Slack webhook token will need to be added to the galasa-devs org Secrets