Fix racy workflows #2895

Job	Run time
detect	1s
build-toolkit	2m 7s
build-matrix (green) / build-os	3m 27s
build-matrix (green) / detect	9s
build-matrix (green) / build-disk	2m 44s
build-matrix (green) / build-iso	1m 31s
build-matrix (green) / test-installer	14m 2s
build-matrix (green) / tests-matrix (test-upgrade)	15m 38s
build-matrix (green) / tests-matrix (test-downgrade)	12m 57s
build-matrix (green) / tests-matrix (test-recovery)	17m 45s
build-matrix (green) / tests-matrix (test-fallback)	11m 3s
build-matrix (green) / tests-matrix (test-fsck)	38m 34s
build-matrix (green) / tests-matrix (test-grubfallback)	9m 3s
	2h 9m 1s

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