Inform the user when the process exits unexpectedly #772

Job	Run time
Build backend	2m 16s
Build frontend	2m 39s
Build stable compiler container	1m 42s
Build beta compiler container	1m 39s
Build nightly compiler container	2m 34s
Build clippy tool container	1m 58s
Build miri tool container	5m 27s
Build rustfmt tool container	1m 6s
Running integration tests	5m 38s
Release artifacts	0s
	24m 59s

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