a simple Kubernetes container to print an env var from a comfig map

pod.yaml

apiVersion: v1
kind: Pod
metadata:
  name: test-pod
spec:
  containers:
    - name: test-container
      image: registry.k8s.io/busybox
      command: [ "echo" ]
      args: [ "$(ENV_VAR_NAME)" ]
      envFrom:
        - configMapRef:
            name: config-map-name