Avoid validating (and thus loading) indexes if the checksum already exists in storage.
In other words, if the YAML is identical to the Artifact in storage, the reconciliation should
be a no-op, and therefore can short-circuit long/heavy operations.
Co-authored-by: Hidde Beydals <hello@hidde.co>
Signed-off-by: Paulo Gomes <paulo.gomes@weave.works>
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