Add comment on blocking jobs to actions

[mikesplain]

To document the changes in kubernetes/test-infra#17857.

/cc @rifelpet

Holding until that PR merges and make sure it works.
/hold

[k8s-ci-robot]

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[rifelpet]

/lgtm

[mikesplain]

Also FYI, branch protection runs hourly: https://github.com/kubernetes/test-infra/blob/a88f4c8938029faecec901355c78fe58a9c14a14/config/jobs/kubernetes/test-infra/test-infra-trusted.yaml#L968-L1007

https://prow.k8s.io/?job=ci-test-infra-branchprotector

[mikesplain]

/hold cancel

[rifelpet]

not sure why tide isn't picking this up...

Pending - Not mergeable

yet the tide link says it's ready to merge. I wonder if this is an issue with kubernetes/test-infra#17917 ?

[mikesplain]

/retest

I’m not sure either. Status reconciler should update and retest if need be. I’ll look tomorrow and worst case we can revert.

[mikesplain]

Close and reopening to re-trigger tests

[hakman]

Same thing here #9233.

[hakman]

@mikesplain I prepared the revert with approval. I just requires the LGTM.