Add Triggers v0.28.x release

[khrm]

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[khrm]

/kind misc

[AlanGreene]

Hi @khrm, thanks for the PR. fyi, the checks are failing because there's no corresponding release branch release-v0.28.x in the Triggers repo

[khrm]

/retest

[AlanGreene]

@khrm Can you rebase to resolve this?

[tekton-robot]

@khrm: PR needs rebase.

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