Only fetch caches if a key actually matched (#433) #139

Job	Run time
test-runtime-format	13s
test-runtime-format	11s
test-runtime-format	18s
build (generic, 32)	44m 53s
build (generic, 32)	27m 11s
build (generic, 32)	20m 28s
test-runtime-functionality	19s
test-runtime-functionality	20s
test-runtime-functionality	16s
build (generic, 64)	45m 31s
build (generic, 64)	22m 26s
build (generic, 64)	20m 44s
build (hifive_unmatched, 64)	1h 1m 53s
build (hifive_unmatched, 64)	22m 10s
build (hifive_unmatched, 64)	20m 44s
build (cva6, 32)	39m 40s
build (cva6, 32)	22m 28s
build (cva6, 32)	20m 49s
build (cva6, 64)	44m 21s
build (cva6, 64)	22m 31s
build (cva6, 64)	20m 45s
build (mpfs, 64)	56m 2s
build (mpfs, 64)	27m 12s
build (mpfs, 64)	20m 44s
combine-caches	14m 8s
combine-caches	0s
combine-caches	0s
test-system / test-generic (generic, 32)	1m 30s
test-system / test-mpfs	6m 36s
test-system / test-generic (generic, 64)	1m 38s
test-runtime-build / build-runtime (generic, 32)	37s
test-runtime-build / build-runtime (generic, 64)	26s
test-runtime-build / build-runtime (hifive_unmatched, 64)	1m 11s
test-runtime-build / build-runtime (cva6, 32)	24s
test-runtime-build / build-runtime (cva6, 64)	27s
test-runtime-build / build-runtime (mpfs, 64)	44s
test-runtime-build	0s
test-runtime-build	0s
test-system	0s
test-system	0s
	9h 49m 50s

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