Handle simultaneous migrations #5

Job	Run time
Clippy	0s
Docker (chain, chain)	2m 0s
Docker (governance, governance)	1m 42s
Format	0s
Build	0s
Docker (pos, pos)	1m 39s
Docker (rewards, rewards)	1m 38s
Tests	0s
Validate Swagger	26s
Docker (seeder, seeder)	1m 57s
Docker (webserver, webserver)	1m 42s
Docker (parameters, parameters)	1m 42s
Docker (transactions, transactions)	1m 57s
can_enqueue	1s
can_merge	0s
	14m 44s

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