## Configure build and start for Flask

### Summary
Configure build and start for a Flask app on Ample. Serve the WSGI app with a production server such as waitress from app.py reading PORT; pass --start "python3 app.py". Ample detects the runtime, installs dependencies, runs the build when present and starts the app on the python-3.12 template behind a public HTTPS URL.

### Prerequisites
- A requirements.txt (or pyproject) and a start command that reads PORT and binds 0.0.0.0  
- An Ample account token with servers:write

### Tested Configuration
- **Template**: python-3.12  
- **Runtime**: python  
- **Size**: s-1vcpu-1gb  
- **Install**: `python3 -m pip install --target .ample/python -r requirements.txt`  
- **Start**: `PYTHONPATH=.ample/python:${PYTHONPATH:-} python3 app.py`

### Workflow Steps
1. **Make the start command bind correctly**  
   Serve the WSGI app with a production server such as waitress from app.py reading PORT; pass --start "python3 app.py".  
2. **Deploy**  
   Run the existing synchronous deploy once from the project directory and read the result. Exit 0 is live, 1 is failed, 2 is blocked on a required preflight action. Re-running with no change is a content-addressed no-op.
   Command: `ample deploy . --name  --public --format json --start "python3 run.py"`
3. **Verify**  
   Fetch the live URL and run the success checks below. On failure read the build log, then the runtime log, fix the cause and deploy again; do not blind-retry.
   Command: `ample logs  --kind build`

### Success Checks
- **Description**: page or root route responds  
  **Kind**: http_get  
  **Path**: /  
  **Expect**: ample canary flask basic

### Limitations
- Verified on the node-22 template at s-1vcpu-1gb; other templates and sizes are not verified by this recipe.
- Region, compliance attestations and request-duration limits are unknown and not claimed.
- Apps auto-pause when idle and wake on the next request; always-on is an operator setting, not a plan feature.
- The Flask development server was not used; waitress was tested.