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* chore: Add signrel command for sigining arc release assets I used this command to sign assets for the recent releases to comply with the recommendation of https://github.com/ossf/scorecard/blob/5758364c82f7fc72b256f9a8cfc89dc550d7dd66/docs/checks.md#signed-releases Ref #1298 * Implement signrel subcommands for listing tags and signing assets, with docs