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Kubernetes pods can export environment variables using the env field in the pod specification. Here's an example:

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
  - name: my-container
    image: my-image
    env:
      - name: MY_ENV_VAR
        value: my-value

This will set the environment variable MY_ENV_VAR to my-value in the container my-container running in the my-pod pod.

If you want to export environment variables using a command, you can use the command and args fields in the container specification, like this:

apiVersion: v1
kind: Pod
metadata:
  name: my-pod
spec:
  containers:
  - name: my-container
    image: my-image
    command: ["sh", "-c", "export MY_ENV_VAR=my-value && <start your application>"]

This will run a shell command that exports the environment variable MY_ENV_VAR with the value my-value, and then starts your application.