Agregar script.py y mejorar Dockerfiles con salida unbuffered y healthcheck optimizado

cron/Dockerfile

@@ -7,4 +7,4 @@ RUN pip install --no-cache-dir -r requirements.txt
 
 COPY script.py .
 
-CMD ["python", "script.py"]
+CMD ["python", "-u", "script.py"]

cron/script.py

@@ -43,4 +43,4 @@ def main():
         time.sleep(1)
 
 if __name__ == "__main__":
-    main()
+    main()