Redirect CI Slack notifications to the the community channel

[yitsushi]

• community channel
• Relevant files:
  • https://github.com/weaveworks-liquidmetal/flintlock/blob/main/.github/workflows/fork.yaml#L71
  • https://github.com/weaveworks-liquidmetal/flintlock/blob/main/.github/workflows/nightly_e2e.yml#L42

[github-actions]

This issue is stale because it has been open 60 days with no activity.

[github-actions]

This issue is stale because it has been open 60 days with no activity.

[github-actions]

This issue is stale because it has been open 60 days with no activity.

[yitsushi]

Someday we still have to do it.

[github-actions]

This issue is stale because it has been open 180 days with no activity.