fix(cmd/gno/clean): allow to run `gno clean -modcache` from anywhere … #28

Job	Run time
setup	4s
Run Main (gnofaucet) / Go Linter / lint	36s
Run Main (gnofaucet) / Go Test / test	30s
Run Main (gnokeykc) / Go Linter / lint	45s
Run Main (gnofaucet) / Go Build / generated	11s
Run Main (gnodev) / Go Build / generated	10s
Run Main (gnodev) / Go Linter / lint	53s
Run Main (gnodev) / Go Test / test	1m 19s
Run Main (gnokeykc) / Go Build / generated	8s
Run Main (gnogenesis) / Go Linter / lint	45s
Run Main (gnogenesis) / Go Test / test	40s
Run Main (gnogenesis) / Go Build / generated	6s
Run Main (gnokeykc) / Go Test / test	43s
Run Main (gnomd) / Go Build / generated	10s
Run Main (gnomd) / Go Linter / lint	37s
Run Main (gnomd) / Go Test / test	26s
Run Main (gnomigrate) / Go Build / generated	7s
Run Main (gnomigrate) / Go Linter / lint	46s
Run Main (gnomigrate) / Go Test / test	36s
	9m 32s

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