Is it possible to import environment variables from a different .yml file into the deployment file. My container requires environment variables.

deployment.yml

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: api-deployment
spec:
  replicas: 1
  template:
    metadata:
      labels:
        app: api
    spec:
      containers:
      - name: api
        image: <removed>
        imagePullPolicy: Always
        env:
        - name: NODE_ENV
          value: "TEST"
        ports:
        - containerPort: 8080
      imagePullSecrets:
      - name: regcred

vars.yml

NODE_ENV: TEST

What i'd like is to declare my variables in a seperate file and simply import them into the deployment.