draft(electrum): validate coinbase merkle test #273

Job	Run time
Check WASM	1m 6s
Check no_std	48s
Build and test (stable, true, --no-default-features --features miniscript/no-std)	1m 56s
Build & Test Examples (example_cli)	34s
Build and test (stable, true, --all-features)	3m 56s
Rust fmt	7s
Build & Test Examples (example_bitcoind_rpc_polling)	31s
prepare	3s
Build and test (1.63.0, --no-default-features --features miniscript/no-std)	3m 20s
Build & Test Examples (example_electrum)	54s
Build and test (1.63.0, --all-features)	6m 12s
Build & Test Examples (example_esplora)	53s
Build & Test Examples (example_wallet_electrum)	56s
Build & Test Examples (example_wallet_esplora_async)	57s
Build & Test Examples (example_wallet_esplora_blocking)	50s
Build & Test Examples (example_wallet_rpc)	33s
clippy_check	55s
	24m 31s

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