Add CI using bitcoin-maintainer-tools #33

Job	Run time
Test - stable toolchain (minimal)	38s
Docs - stable toolchain (recent)	19s
Prepare	3s
Test - stable toolchain (recent)	21s
Integration tests - stable toolchain (26_0)	1m 18s
Integration tests - stable toolchain (25_2)	1m 16s
Integration tests - stable toolchain (25_1)	1m 19s
Integration tests - stable toolchain (25_0)	1m 13s
Integration tests - stable toolchain (24_2)	1m 15s
Integration tests - stable toolchain (24_1)	44s
Integration tests - stable toolchain (24_0_1)	41s
Integration tests - stable toolchain (23_2)	1m 23s
Integration tests - stable toolchain (23_1)	1m 24s
Integration tests - stable toolchain (22_1)	1m 32s
Integration tests - stable toolchain (22_0)	2m 20s
Integration tests - stable toolchain (0_21_2)	36s
Integration tests - stable toolchain (0_20_2)	38s
Integration tests - stable toolchain (0_19_1)	39s
Integration tests - stable toolchain (0_18_1)	36s
Integration tests - stable toolchain (0_17_2)	1m 50s
Test - nightly toolchain (minimal)	26s
Lint - nightly toolchain (recent)	32s
Test - nightly toolchain (recent)	27s
Docs - nightly toolchain (recent)	35s
	22m 5s

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