Downloads the signature-database shards into the cache, verified by hash and skipping cached ones. A failing file
does not stop the others; a SigDbDownloadError names what is missing at the end.
Use the returned SigDbDownloadResult.manifest, or point solver.sigdb.additionalPaths at the dir.
Downloads the signature-database shards into the cache, verified by hash and skipping cached ones. A failing file does not stop the others; a SigDbDownloadError names what is missing at the end. Use the returned SigDbDownloadResult.manifest, or point
solver.sigdb.additionalPathsat the dir.