workflows: fix L4LB test missing PR reporting on issue_comment

[nbusseneau]

Unlike pull_request-triggered runs, issue_comment-triggered runs cannot automatically report back to the PR they were triggered from.

Adding manual reporting as per the other workflows.

[aditighag]

🚀

[nbusseneau]

L4LB test failed: https://github.com/cilium/cilium/actions/runs/1012162379
But this is the expected unrelated failure that's been happening in all L4LB runs:

+ kubectl -n kube-system wait --for=condition=Ready pod cilium-2kpf2 --timeout=5m
error: timed out waiting for the condition on pods/cilium-2kpf2

The manual PR check did get added properly to the PR:

So I would say the changes are validated.

Removing temp commit.

[aditighag]

Btw I see this note in the workflow yaml [1] -

### FOR TESTING PURPOSES
  # This workflow runs in the context of `master`, and ignores changes to
  # workflow files in PRs. For testing changes to this workflow from a PR:
  # - Make sure the PR uses a branch from the base repository (requires write
  #   privileges). It will not work with a branch from a fork (missing secrets).
  # - Uncomment the `pull_request` event below, commit separately with a `DO
  #   NOT MERGE` message, and push to the PR. As long as the commit is present,
  #   any push to the PR will trigger this workflow.
  # - Don't forget to remove the `DO NOT MERGE` commit once satisfied. The run
  #   will disappear from the PR checks: please provide a direct link to the
  #   successful workflow run (can be found from Actions tab) in a comment.
  # 
  # pull_request: {}
  ###

Edit : Nvm, saw this comment - #16830 (comment).

[1] https://github.com/cilium/cilium/blob/master/.github/workflows/tests-l4lb.yaml

[aditighag]

@nbusseneau @brb Does this GH action need to be run as a cron job if it's run on ever PR?

[nbusseneau]

@nbusseneau @brb Does this GH action need to be run as a cron job if it's run on ever PR?

It's there for testing master every 6 hours so that we can detect when merging multiple concurrent PRs might be breaking things :)