kustomize listに項目を追加

kustomizeでlistに要素を追加する方法

deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app
spec:
  template:
    spec:
      containers:
        - name: app
          env:
            - name: ENV1
              value: env1
          resources:
            requests:
              cpu: 250m
              memory: 512Mi

deployment-patch.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app
spec:
  template:
    spec:
      containers:
        - name: app
          image: my-image
          env:
            - name: ENV2
              value: env2

kustomization.yaml

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
resources:
  - ../../../../base/app
patches:
  - path: deployment-patch.yaml
    target:
      kind: Deployment

kustomize build

build.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: app
spec:
  template:
    spec:
      containers:
      - env:
        - name: ENV2
          value: env2
        - name: ENV1
          value: env1
        image: my-image
        name: app
        resources:
          requests:
            cpu: 250m
            memory: 512Mi

Deploymentにimage,envなどを追加するときはdeployment-patch.yamlでcontainersのnameを指定しないといけない。（nameが識別子となる）

しかし、Ingressでrulesのhostを置換する場合はこの方法は使えないみたい。（rulesにnameがないため？）
現状Path JSON6902を使用するのがよさそうだが別の手段が欲しい。

https://github.com/kubernetes-sigs/kustomize/issues/581
https://github.com/kubernetes-sigs/kustomize/issues/347