Firebase functions deployment without custom env variables

deployment.yml

name: Deploy

# Controls when the workflow will run
'on':
  #triggers the workflow whenever a push is made to the main branch
  push:
    branches:
      - main

jobs:
  #this workfloe has only one job
  deploy_to_production:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      # this install the dependencies specified in your package.json file into the current workflow
      - name: install dependencies
        # navigates to your functions folder and install the dependencies
        run: cd functions/ && npm install
        # If your firebase cloud functions project uses firebase-admin 
        # you need to create a config file used to initialize your project
        # the below task creates a config.json file in your functions directory
      - name: create config json
        uses: jsdaniell/create-json@1.1.2
        id: create-config-json
        with:
          name: 'config.json'
          json: '{"type": "${{ secrets.TYPE }}","auth_uri": "${{ secrets.AUTH_URI }}","auth_provider_x509_cert_url": "${{ secrets.AUTH_PROVIDER_X509_CERT_URL }}","private_key_id": "${{ secrets.PRIVATE_KEY_ID }}","project_id": "${{ secrets.PROJECT_ID }}","private_key": "${{ secrets.PRIVATE_KEY }}","token_uri": "${{ secrets.TOKEN_URI }}", "client_email": "${{ secrets.CLIENT_EMAIL }}","client_x509_cert_url": "${{ secrets.CLIENT_X509_CERT_URL }}","client_id": "${{ secrets.CLIENT_ID }}"}'
          dir: 'functions/'
        # The below task uses the w9jds/firebase-action@master action with the appropriate argument 
        # to deploy your firebase cloud functions.
      - name: deploy to production
        uses: w9jds/firebase-action@master
        with:
          args: deploy --only functions
        env:
          FIREBASE_TOKEN: ${{ secrets.FIREBASE_TOKEN }}