Add a configurable alert to convey shutdown info #133

Job	Run time
Cleanup PR images from ghcr.io (anomalycor)	3s
Cleanup PR images from ghcr.io (cb-ceiling)	2s
Cleanup PR images from ghcr.io (ceil-vis)	3s
Cleanup PR images from ghcr.io (ceil-vis15)	3s
Cleanup PR images from ghcr.io (ensemble)	2s
Cleanup PR images from ghcr.io (landuse)	5s
Cleanup PR images from ghcr.io (precipAccum)	5s
Cleanup PR images from ghcr.io (precipGauge)	4s
Cleanup PR images from ghcr.io (precipitation1hr)	3s
Cleanup PR images from ghcr.io (ptype)	5s
Cleanup PR images from ghcr.io (radar)	5s
Cleanup PR images from ghcr.io (scorecard)	4s
Cleanup PR images from ghcr.io (surface)	3s
Cleanup PR images from ghcr.io (surfrad)	2s
Cleanup PR images from ghcr.io (upperair)	5s
	54s

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