add test private key #111

Job	Run time
checks / mypy	31s
checks / formatting	23s
checks / ruff	7s
regtest (3.10, 1.5.1, CoreLightningRestWallet) / regtest	2m 46s
regtest (3.10, 1.5.1, LNbitsWallet) / regtest	2m 33s
regtest (3.10, 1.5.1, LndRestWallet) / regtest	2m 26s
tests (ubuntu-latest, 3.10, 1.5.1, false, FakeWallet) / poetry	1m 27s
tests (ubuntu-latest, 3.10, 1.5.1, true, FakeWallet) / poetry	1m 26s
	11m 39s

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