GitHub reviews should act as /lgtm + /approve for SIG Release repos

[justaugustus]

GitHub reviews should act as /lgtm + /approve for SIG Release repos.
Filing an issue for this...
Original issue: kubernetes/sig-release#1464
Implementation example: kubernetes/test-infra#20934
cc: @kubernetes-sigs/release-engineering

Originally posted by @justaugustus in #27 (comment)

[justaugustus]

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/help

[k8s-ci-robot]

@justaugustus:
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