MaxBondABE/attempt: CLI for retrying fallible commands

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attempt allows you to retry fallible commands with a delay.

attempt [BACKOFF] [OPTIONS] [COMMAND]...

# Rerun database migrations if the server was not ready
attempt --retry-if-contains "server not ready" sqlx migrate

# Use an exponential backoff
attempt exponential --retry-if-contains "server not ready" sqlx migrate



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