Add Regtest network #379

Job	Run time
Latest build on ubuntu-latest	1m 14s
Bitrot check	1m 18s
Latest build on windows-latest	3m 30s
Latest build on macOS-latest	1m 26s
Build target wasm32-wasi	1m 6s
Check ZFuture build on Linux	1m 8s
Clippy (MSRV)	1m 9s
Check ZFuture build on macOS	1m 26s
Clippy (beta)	11s
Check ZFuture build on Windows	3m 14s
Code coverage	6m 7s
Intra-doc links	1m 29s
Rustfmt	13s
protobuf consistency	52s
Test on Linux	5m 55s
UUID validity	3s
Test Orchard on Linux	6m 24s
Test NU6 on Linux	8m 40s
Test on macOS	5m 59s
Test Orchard on macOS	8m 58s
Test on Windows	11m 41s
Test Orchard on Windows	9m 49s
Test NU6 on Windows	13m 7s
	1h 34m 59s

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