add testing argo workflow for s3 backup

Testing the script with backing up to demo bucket (backup-registry-2) for now. This will be replaced with 2nd network hub afterwards.

Ref. #64 (closed)

added A-registry p2 labels

assigned to @akothiwa

mentioned in issue #64 (closed)

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• 88caccea - add workflow only enabling registry s3 backup

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resolved all threads

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requested review from @digaponc and @rbritoda

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requested review from @strigazi