instruction: Create a comprehensive Dockerfile for networking applications with best practices
output: ```dockerfile
  from within
  your own application code. The token expires automatically and can rotate
  upon expiration.
  If you have a legacy application that is not aware of Kubernetes, you
  could use a sidecar container within the same pod to fetch these tokens
  and make them available to the application workload.Token Volume Projection
  (also recommended): In Kubernetes v1.20 and later, use the Pod specification to
  tell the kubelet to add the service account token to the Pod as a
  projected volume. Projected tokens expire automatically, and the kubelet
  rotates the token before it expires.Service Account Token Secrets
  (not recommended): You can mount service account tokens as Kubernetes
  Secrets in Pods. These tokens don't expire and don't rotate. In versions prior to v1.24, a permanent token was automatically created for each service account.
  This method is not recommended anymore, especially at scale, because of the risks associated
  with static, long-lived credentials. The LegacyServiceAccountTokenNoAutoGeneration feature gate
  (which was enabled by default
  ```