genesis: use env to configure pre-genesis chain-id #966

Job	Run time
changelog	15s
check-packages	5m 9s
build-binaries	9m 28s
build-wasm (wasm, build-wasm-scripts, wasm/tx_.wasm wasm/vp_.wasm wasm/checksums.json )	4m 4s
lints	5m 22s
rust-docs	6m 8s
build-wasm (wasm-for-tests, build-wasm-tests-scripts, wasm_for_tests/*.wasm)	3m 7s
test-wasm	7m 6s
check-benchmarks	9m 42s
test-unit	10m 16s
test-integration	16m 45s
test-e2e (0)	21m 30s
test-e2e-with-device-automation	9m 23s
test-e2e (1)	17m 13s
test-e2e (2)	17m 16s
test-e2e (3)	18m 24s
test-e2e (4)	21m 44s
upload-coverage	9s
	3h 3m 1s

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