supercronic: Optional SIGTERM at Job Failure

I would like to THANK YOU for this brilliant piece of software!

I have a use case in which supercronic acts as the entry-point of a container. That leads to the necessity to restart the container if the job that is run by supercronic fails.

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@hartwork A question - is this exposed by default?

It needs something like supercronic -prometheus-listen-address localhost:9746 [..] but that’s all. The :9746 can be omitted if your copy of supercronic is fresh enough to include PR #81.