feat: store first block in epoch (#83) #277

Job	Run time
Build	0s
Clippy	0s
Format	0s
Docker (chain, chain)	8m 45s
Docker (governance, governance)	8m 53s
Validate Swagger	26s
Docker (pos, pos)	8m 47s
Docker (rewards, rewards)	8m 51s
Docker (seeder, seeder)	8m 41s
Docker (webserver, webserver)	9m 27s
Docker (parameters, parameters)	9m 1s
Docker (transactions, transactions)	8m 40s
can_enqueue	1s
can_merge	0s
	1h 11m 32s

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