我试着用init容器准备环境变量，这样这些变量就可以在“实际”容器中使用。下面是我使用的基本代码：

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp-deployment
  labels:
    app.kubernetes.io/name: MyApp
spec:
  replicas: 1  # You can adjust the number of replicas as needed
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      labels:
        app: myapp
    spec:
      containers:
      - name: myapp-container
        image: busybox:1.28
        command: ['sh', '-c', 'echo here && echo $MY_VARIABLE && sleep 3600']
      initContainers:
      - name: init-myservice
        image: busybox:1.28
        command: ['sh', '-c', 'export MY_VARIABLE="some_value" && sleep 1']

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但是，主容器无法识别我在initContainer中创建的变量。
你能帮我怎么做到这一点？