feat(examples): add `r/leon` #4230

Job	Run time
setup	4s
Run Main (gnodev) / Go Build / generated	9s
Run Main (gnodev) / Go Test / test	1m 27s
Run Main (gnodev) / Go Linter / lint	45s
Run Main (gnofaucet) / Go Build / generated	6s
Run Main (gnofaucet) / Go Linter / lint	29s
Run Main (gnofaucet) / Go Test / test	36s
Run Main (gnokeykc) / Go Build / generated	7s
Run Main (gnokeykc) / Go Linter / lint	42s
Run Main (gnokeykc) / Go Test / test	42s
Run Main (gnomd) / Go Build / generated	8s
Run Main (gnomd) / Go Test / test	31s
Run Main (gnomd) / Go Linter / lint	22s
	6m 8s

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