#209: Switch to new Bitcoin Signet #7

Job	Run time
Validate generated backend Docker JSON	9s
Backend (dev) - node 20	1m 31s
Cache assets for builds	35s
Backend (prod) - node 20	57s
Backend (dev) - node 21	1m 36s
Backend (prod) - node 21	1m 2s
Frontend (dev) - node 20	2m 25s
Frontend (prod) - node 20	1m 57s
Frontend (dev) - node 21	2m 13s
Frontend (prod) - node 21	2m 4s
E2E tests for mempool	4m 49s
E2E tests for liquid	5m 36s
	24m 54s

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