Feat/offline election prediction tool #1406

Job	Run time
set-image	2s
Build polkadot-staking-miner binary	4m 0s
Clippy	3m 14s
Check documentation	1m 38s
Run tests	3m 57s
Check formatting	54s
Check code	2m 22s
Test Docker image build	25s
Build and publish Docker image	-1s
	16m 31s

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