truncate runDir path name #574

Job	Run time
context (ubuntu-latest)	29s
daemon-config (ubuntu-latest)	29s
channel (ubuntu-latest)	35s
context (macos-latest)	1m 9s
daemon-config (macos-latest)	1m 9s
build-linux	39s
channel (macos-latest)	1m 10s
context (windows-latest)	38s
daemon-config (windows-latest)	40s
channel (windows-latest)	36s
build-macos (macos-13)	9m 38s
build-windows	58s
lima-start-args	1m 4s
build-macos (macos-latest)	1m 14s
main (ubuntu-latest, pinned)	30s
main (ubuntu-latest, latest)	42s
set-host	32s
main (macos-13, pinned)	6m 23s
main (macos-13, latest)	5m 33s
main (macos-latest, pinned)	1m 7s
main (macos-latest, latest)	1m 10s
main (windows-latest, pinned)	35s
main (windows-latest, latest)	47s
	37m 47s

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