Deploy Flutter web app to remote server using rsync

deploy.yaml

name: Deploy to remote server

on:
  push:
    branches: [ develop ]

jobs:
  deploy:
    runs-on: ubuntu-latest

    steps:

      - name: Checkout code
        uses: actions/checkout@v3

      - name: Install SSH Key
        uses: shimataro/ssh-key-action@v2
        with:
          key: ${{ secrets.SSH_PRIVATE_KEY }}
          known_hosts: 'just-a-placeholder-so-we-dont-get-errors'
          
      - name: Adding Known Hosts
        run: ssh-keyscan -H ${{ secrets.REMOTE_HOST }} >> ~/.ssh/known_hosts

      - name: Install Flutter
        uses: subosito/flutter-action@v2
        with:
          flutter-version: '3.10.0'
          channel: 'stable'
          
      - name: Flutter clean && Install dependancies
        run: |
          flutter clean
          flutter pub get
      - name: Build web app
        run: flutter build web --release

      - name: Deploy with rsync
        run: rsync -avz --delete --force ./build/web/ ${{ secrets.REMOTE_USER }}@${{ secrets.REMOTE_HOST }}:${{ secrets.REMOTE_TARGET }}

Checkout this article : https://zellwk.com/blog/github-actions-deploy/