genesis: use env to configure pre-genesis chain-id #965

Job	Run time
build-binaries	9m 36s
changelog	15s
check-packages	5m 8s
build-wasm (wasm, build-wasm-scripts, wasm/tx_.wasm wasm/vp_.wasm wasm/checksums.json )	3m 43s
lints	5m 15s
rust-docs	6m 3s
build-wasm (wasm-for-tests, build-wasm-tests-scripts, wasm_for_tests/*.wasm)	3m 0s
test-unit	10m 6s
test-wasm	6m 41s
check-benchmarks	10m 4s
test-integration	16m 23s
test-e2e-with-device-automation	8m 36s
test-e2e (0)	21m 33s
test-e2e (1)	16m 44s
test-e2e (2)	17m 18s
test-e2e (3)	18m 0s
test-e2e (4)	21m 29s
upload-coverage	9s
	3h 0m 3s

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