deployment-with-config-in-volume.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: testapp
spec:
  selector:
    matchLabels:
      app: testapp
  replicas: 1
  template:
    metadata:
      labels:
        app: testapp
    spec:
      volumes:
        - name: config-data-volume
          configMap:
            name: app-config
      containers:
      - name: testapp
        image: testapp
        volumeMounts:
        - mountPath: /config
          name: config-data-volume