Add (optional) extra release tags on publish

Ronny Moreasrequested to merge
rmoreas/cnb:feat/add-extra-tags-on-publish into master

What does this MR do?

It adds the ability to specify additional tags for the release image during publishing, mirroring the behavior already available in the Docker component (see docker!85 (merged))

Checklist

  • General:
  • Publicly usable:
    • untagged runners
    • no proxy configuration but support http_proxy/https_proxy/no_proxy
    • no custom CA certificate(s) but supports $CUSTOM_CA_CERTS or $DEFAULT_CA_CERTS to declare custom CA certificate(s)
    • internet hostnames/urls only
  • Used Docker images:
    • public images
    • official images (when possible)
    • latest tag (when possible)
  • Documented:
    • README.md documents the new feature
    • kicker.json describes the new feature
  • Tested & examplified:
    • (url to a project sample successfully using the new feature)
Edited by Ronny Moreas

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