Fetch version from lodestar package package.json

[dapplion]

Motivation

Docker build nightly breaks due to fetching the version from root package.json

npm ERR! code ETARGET
npm ERR! notarget No matching version found for @chainsafe/lodestar-cli@undefined.
npm ERR! notarget In most cases you or one of your dependencies are requesting
npm ERR! notarget a package version that doesn't exist.

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2021-06-10T10_09_11_007Z-debug.log
The command '/bin/sh -c npm install @chainsafe/lodestar-cli@$VERSION' returned a non-zero code: 1

https://github.com/ChainSafe/lodestar/runs/2792369225?check_suite_focus=true

Description

Fetch version from lodestar package json

[codeclimate]

Code Climate has analyzed commit 7efb776 and detected 0 issues on this pull request.

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