Support Slack notifications

[zachlloyd]

It would be nice if this supported Slack.

[github-actions]

Triage: duplicate

This issue is a duplicate of #4, which describes the same request ("It would be nice if this supported Slack.") with identical title and body. The same request has also been filed as #9 and #14.

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[zachlloyd]

Triage correction: not a duplicate — the matched issue was closed as a superseded re-seed, not as an open request covering this. This one-liner has no detail about what Slack support means (notifications? where? for what events?), so the correct bucket is needs-info.