Implement CI for hifive unmatched #231

Job	Run time
test-runtime-format	11s
test-runtime-format	11s
test-runtime-functionality	18s
test-runtime-functionality	18s
build (generic, 32)	30m 28s
build (generic, 32)	30m 28s
build (generic, 64)	28m 33s
build (generic, 64)	28m 33s
build (hifive_unmatched, 64)	33m 19s
build (hifive_unmatched, 64)	32m 36s
build (cva6, 32)	23m 39s
build (cva6, 32)	23m 39s
build (cva6, 64)	27m 9s
build (cva6, 64)	27m 9s
build (mpfs, 64)	37m 7s
build (mpfs, 64)	37m 7s
combine-caches	14m 9s
combine-caches	13m 55s
test-runtime-build	0s
test-system-functionality	0s
test-runtime-build / build-runtime (generic, 32)	28s
test-system-functionality / test-system (generic, 32)	1m 48s
test-runtime-build / build-runtime (generic, 64)	39s
test-runtime-build / build-runtime (hifive_unmatched, 64)	51s
test-system-functionality / test-system (generic, 64)	1m 39s
test-runtime-build / build-runtime (cva6, 32)	26s
test-system-functionality / test-system (mpfs, 64)	1s
test-runtime-build / build-runtime (cva6, 64)	27s
test-system-functionality / test-system (cva6, 64)	15s
test-runtime-build / build-runtime (mpfs, 64)	51s
test-system-functionality / test-system (hifive_unmatched, 64)	9m 14s
	6h 45m 28s

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