Nextjs deployment with github workflow to netlify using netlify cli and the nextjs runtime of netlify

gistfile1.txt

## create a `netlify.toml` file in the root of your project directory with this config:
[[plugins]]
package = "@netlify/plugin-nextjs"

[build]
command = "npm run build"
publish = ".next"


## A sample workflow that works:

name: Deploy to Netlify Production on merge
on:
  push:
    branches:
      - main
jobs:
  deploy_and_publish:
    name: 'Deploy'
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3
      - name: Setup Node.js
        uses: actions/setup-node@v3
        with:
          node-version: 18
      - name: Install Netlify CLI
        run: npm install -g netlify-cli
      - name: Install deps
        run: npm install
      - name: Deploy
        run: ntl deploy --build --prod
        env:
          NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_PROD_TOKEN_SECRET }} 
          NETLIFY_SITE_ID: ${{ secrets.NETLIFY_PROD_SITE_ID }}

you have to generate these from your netlify account:
 - NETLIFY_AUTH_TOKEN
 - NETLIFY_SITE_ID