ci: use fmt-check #691

Job	Run time
Clippy	42s
Format	25s
Tests	1m 20s
Docker (chain, chain)	3m 9s
Docker (governance, governance)	2m 45s
Validate Swagger	27s
Docker (pos, pos)	3m 41s
Docker (rewards, rewards)	2m 46s
Docker (seeder, seeder)	2m 39s
Docker (webserver, webserver)	3m 0s
Docker (parameters, parameters)	3m 47s
Docker (transactions, transactions)	2m 50s
can_enqueue	1s
can_merge	0s
	27m 32s

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