Github actions CD script git pull error | NestJS | Page 1

I am trying to setup CD to my VPS using github acitons.
But I am getting this error:

err: [email protected]: Permission denied (publickey).
err: fatal: Could not read from remote repository.
err: Please make sure you have the correct access rights
err: and the repository exists.

Here is my workflow.yml

name: Worldcorp dev CD

on:
  push:
    branches: [ dev ]
env:
  MODE: DEV
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
    - name: Deploy using ssh
      uses: appleboy/ssh-action@master
      with:
        host: ${{ secrets.HOST }}
        username: ${{ secrets.USERNAME }}
        key: ${{ secrets.PRIVATE_KEY }}
        port: 22
        script: |
          cd /home/worldcorp/backend/dev/main/
          git pull origin dev
    - run: npm install --only=prod
    - run: npm run build
    - name: Restart pm2
      uses: appleboy/ssh-action@master
      with:
        host: ${{ secrets.HOST }}
        username: ${{ secrets.USERNAME }}
        key: ${{ secrets.PRIVATE_KEY }}
        port: 22 
        script: |
          pm2 restart wc-main-back

#Github actions CD script git pull error