Don't build a container image, just mount your app as a configmap!

gistfile1.txt

apiVersion: v1
kind: ConfigMap
metadata:
  name: hello-world-configmap
data:
  hello.py: |
    import logging
    import time
    import signal
    import sys

    def graceful_shutdown(signum, frame):
        logging.info("Received termination signal. Shutting down gracefully...")
        # Perform cleanup actions here
        sys.exit(0)

    logging.basicConfig(format='%(asctime)s - %(levelname)s - %(message)s', level=logging.INFO)
    logger = logging.getLogger(__name__)

    signal.signal(signal.SIGTERM, graceful_shutdown)

    while True:
        logger.info("Hello, World!")
        time.sleep(2)

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-world-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: hello-world
  template:
    metadata:
      labels:
        app: hello-world
    spec:
      containers:
      - name: hello-world-container
        image: python:3.11
        command: ["python", "/app/hello.py"]
        volumeMounts:
        - name: config-volume
          mountPath: /app
      volumes:
      - name: config-volume
        configMap:
          name: hello-world-configmap