Add CI using bitcoin-maintainer-tools #35

Job	Run time
Docs - stable toolchain (recent)	32s
Prepare	8s
Integration tests - stable toolchain (26_0)	1m 40s
Test - stable toolchain (minimal)	22s
Test - stable toolchain (recent)	21s
Integration tests - stable toolchain (25_2)	1m 43s
Integration tests - stable toolchain (25_1)	55s
Integration tests - stable toolchain (25_0)	1m 16s
Integration tests - stable toolchain (24_2)	41s
Integration tests - stable toolchain (24_1)	1m 0s
Integration tests - stable toolchain (24_0_1)	1m 17s
Integration tests - stable toolchain (23_2)	45s
Integration tests - stable toolchain (23_1)	1m 6s
Integration tests - stable toolchain (23_0)	1m 27s
Integration tests - stable toolchain (22_1)	39s
Integration tests - stable toolchain (22_0)	1m 24s
Integration tests - stable toolchain (0_21_2)	43s
Integration tests - stable toolchain (0_20_2)	34s
Integration tests - stable toolchain (0_19_1)	1m 18s
Integration tests - stable toolchain (0_18_1)	37s
Integration tests - stable toolchain (0_17_2)	1m 28s
Docs - nightly toolchain (recent)	28s
Test - nightly toolchain (minimal)	31s
Lint - nightly toolchain (recent)	36s
Test - nightly toolchain (recent)	28s
	21m 59s

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