Add ok-to-test label to self-upgrade PRs

[erikgb]

Now that we use a token from Octo STS, this is required to trigger workflows. Example: cert-manager/webhook-cert-lib#63

I see no harm in merging this to the main branch, even if we decide to not move forward with Octo STS.

/cherry-pick octo-sts-poc
/cc @ThatsMrTalbot

[ThatsMrTalbot]

/lgtm
/approve

[cert-manager-prow]

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[cert-manager-bot]

@erikgb: new pull request created: #382

Details

In response to this:

Now that we use a token from Octo STS, this is required to trigger workflows. Example: cert-manager/webhook-cert-lib#63

I see no harm in merging this to the main branch, even if we decide to not move forward with Octo STS.

/cherry-pick octo-sts-poc
/cc @ThatsMrTalbot

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