This bitbucket pipeline fails to build or push to DigitalOcean Droplet

[Shalaw Fatah]

We have a bitbucket repo done with React (GatsbyJS), and WP CMS, it builds normally on my local machine, also through SSH on DigitalOcean droplet. But when I want automate the task through this pipeline, it fails, why? 

image: node:16.14.0

pipelines:
  default:
    - step:

name: Build Guidedby2

caches:

 - node

script:

 - npm install --legacy-peer-deps

 - npm run half-prod

artifacts:

 - public/**

 - step:

name: Deploy artifacts using SCP to PROD

deployment: production

script:

 - pipe: atlassian/scp-deploy:1.2.1

variables:

USER: $USER

SERVER: $SERVER

REMOTE_PATH: '/home/shalaw/guidedby-react/public'

LOCAL_PATH: 'public/*'

SSH_KEY: $SSH_KEY