Github actions error with wasp in /app

Here is my github action file:
name: Deploy to Fly

on:
push:
branches:
- "master" # Or "main"

jobs:
deploy:
name: Deploy with Wasp
runs-on: ubuntu-latest
steps:
- name: Checkout Repository
uses: actions/checkout@v4

# --- Start Debugging Steps ---
- name: List files in root directory
run: ls -la
# This shows if the 'app' directory is present at the top level after checkout

- name: List files in app directory
run: ls -la ./app
# This shows the contents of the 'app' directory
# Check if main.wasp and other expected files/folders (like src) are listed here
# --- End Debugging Steps ---

- name: Deploy to Fly via Wasp
uses: wasp-lang/deploy-action@main
with:
fly-token: ${{ secrets.FLY_TOKEN }}
# node-version: "20.18.0" # Optional
working-directory: ./app # Keep this as your project is in ./app

Getting this error:
Couldn't find wasp project root - make sure you are running this command from a Wasp project.