your_script.py

import time
from pathlib import Path

Path('outputs').mkdir(exist_ok=True, parents=True)

# Open the file in append mode
with open("outputs/message.txt", "a") as file:
    for i in range(20):
        # Append the value of i to the file
        file.write(str(i) + "\n")
        print(f"Wrote {i}. Sleeping for 1 min")
        # Wait for a minute
        time.sleep(60)

Path('done.txt').touch()