simple config map with pod using the its data

example.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: simpleconfig
data:
  foo: bar
  hello: world
---
apiVersion: v1
kind: Pod
metadata:
  name: pod2
spec:
  containers:
  - name: nginx
    image: nginx
    env:
      - name: FOO_ENV_VAR
        valueFrom:
          configMapKeyRef:
            name: simpleconfig
            key: foo
      - name: HELLO_ENV_VAR
        valueFrom:
          configMapKeyRef:
            name: simpleconfig
            key: hello