Build fail with Circle CI at build step

[jimni1222]

Describe the bug
I added build step in workflow_publish, but there is no install step in there.
So "sh: 1: gulp: not found" error is occured.

How to reproduce
Try to publish caver-js module through circle ci.

Expected behavior
caver-js can be published successfully without error.

Attachments
If applicable, add data, logs or screenshots to help explain your problem.

Environment (please complete the following information)

• caver-js v1.0.1-rc.10
• macOS/10.14

Additional context
Error in Circle CI

#!/bin/bash -eo pipefail
npm run build

caver-js@1.0.0 build /home/circleci/repo
gulp default

sh: 1: gulp: not found
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! caver-js@1.0.0 build: gulp default
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the caver-js@1.0.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?

npm ERR! A complete log of this run can be found in:
npm ERR! /home/circleci/.npm/_logs/2019-08-13T05_17_41_347Z-debug.log
Exited with code 1