Add ETH_PRIVATE_KEY to Docker entrypoint #3863

Job	Run time
coverage	18m 31s
matrix	19s
build / linux-amd64-pinned-all	1h 22m 9s
build / macos-amd64-pinned-all	1h 35m 27s
build / windows-amd64-pinned-unittest	35m 28s
build / windows-amd64-pinned-contract	21m 45s
build / windows-amd64-pinned-integration	1h 29m 38s
build / windows-amd64-pinned-tools	23m 18s
build / status	1s
	6h 6m 36s

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