[release-v0.56.x] Backport release "scripts" changes from main…

[vdemeester]

Changes

… as we switch to ghcr.io, we need those to be updated to work as they are referered during releases.

Related PRs

• Make image registry regions configurable #8246
• Add OCI source label to images #8247
• Support separate bucket and image reg creds #8251
• Run build and tests conditionally #8252
• Fix the imageRegistryUser param usage in the release pipeline #8256
• Propagate image registry regions to publish #8259
• Add KO_EXTRA_ARGS #8260
• Adapt koparse step to handle no import path #8261
• Use the new version of koparse in the build #8278
• Simply the path for the base image #8290
• Update the release cheat-sheet #8302

/assign @afrittoli
/kind misc

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• 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

[tekton-robot]

The following Tekton test failed:

Test name	Commit	Details	Required	Rerun command
check-pr-has-kind-label	16cf93d	link	true	/test check-pr-has-kind-label

[afrittoli]

/approve

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