tekton: fix bugfix-release.sh script

[vdemeester]

Changes

• Images are now ghcr.io and not gcr.io
• Add a "latest" option (default to false)

Signed-off-by: Vincent Demeester [email protected]

/kind misc

Submitter Checklist

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• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
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Release Notes

NONE

[vdemeester]

cc @afrittoli

[tekton-robot]

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[vdemeester]

/retest