Add ETH_PRIVATE_KEY to Docker entrypoint #3862

Job	Run time
coverage	19m 8s
matrix	21s
build / linux-amd64-pinned-all	1h 26m 16s
build / macos-amd64-pinned-all	1h 26m 13s
build / windows-amd64-pinned-unittest	35m 21s
build / windows-amd64-pinned-contract	21m 58s
build / windows-amd64-pinned-integration	1h 29m 17s
build / windows-amd64-pinned-tools	22m 51s
build / status	1s
	6h 1m 26s

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