Add initContainer parameter to the controller's template

[InsomniaCoder]

Is this a bug fix or adding new feature?

• adding new feature

What is this PR about? / Why do we need it?

• Make the chart able to accept custom initContainers for the controller

see: #1378

What testing is done?

Manually tested by helm template:

helm template . with initContainers: []

# Source: aws-ebs-csi-driver/templates/controller.yaml
# Controller Service
kind: Deployment
apiVersion: apps/v1
  ...
      containers:
        - name: ebs-plugin
          image: public.ecr.aws/ebs-csi-driver/aws-ebs-csi-driver:v1.11.2
          imagePullPolicy: IfNotPresent
          args:
            - controller
            - --endpoint=$(CSI_ENDPOINT)
            - --logtostderr
            - --v=2
  ...

helm template . with

- name: wait
  image: busybox
  command: [ 'sh', '-c', "sleep 20" ]

---
# Source: aws-ebs-csi-driver/templates/controller.yaml
# Controller Service
kind: Deployment
apiVersion: apps/v1
    spec:
      nodeSelector:
        kubernetes.io/os: linux
      serviceAccountName: ebs-csi-controller-sa
      initContainers:
        - command:
          - sh
          - -c
          - sleep 20
          image: busybox
          name: wait
      containers:
        - name: ebs-plugin
          image: public.ecr.aws/ebs-csi-driver/aws-ebs-csi-driver:v1.11.2
          imagePullPolicy: IfNotPresent
          args:
            - controller
            - --endpoint=$(CSI_ENDPOINT)
            - --logtostderr
            - --v=2
            ...
---

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: InsomniaCoder / name: Tanat Lokejaroenlarb (9fb4ada)

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @InsomniaCoder. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[torredil]

/ok-to-test

[torredil]

Thanks!
/lgtm

[ConnorJC3]

/lgtm

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@ConnorJC3: changing LGTM is restricted to collaborators

In response to this:

/lgtm

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[InsomniaCoder]

thank you guys! looking forward to see this feature 😄
/assign @torredil

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ConnorJC3, InsomniaCoder, torredil

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