Add script to generate manifest of pod with specified amount of volumes

[AndrewSirenko]

Is this a bug fix or adding new feature?
Tool
What is this PR about? / Why do we need it?
Adds a script to generate manifest of pod with certain # PVs and node-afinity via the go templating package.

This script will be used in a bash script that tests the attachment limit of a specified instance type.

What testing is done?
Generating a manifest with script, and deploying it to active cluster

❯ go run generate_example_manifest.go --node-affinity 'kubernetes.io/os:linux' --volume-count 4
apiVersion: v1
kind: Pod
metadata:
  name: device-limit-tester-4-volumes
spec:
  affinity:
    nodeAffinity:
      requiredDuringSchedulingIgnoredDuringExecution:
        nodeSelectorTerms:
        - matchExpressions:
          - key: kubernetes.io/os
            operator: In
            values:
            - linux
  containers:
  - name: device-limit-tester-4-volumes
    image: centos
    command: ["/bin/sh"]
    args: ["-c", "while true; do echo $(date -u) >> /data/out.txt; sleep 5; done"]
    volumeMounts:
    - name: persistent-storage-0
      mountPath: /data-0
    - name: persistent-storage-1
      mountPath: /data-1
    - name: persistent-storage-2
      mountPath: /data-2
    - name: persistent-storage-3
      mountPath: /data-3
  volumes:
    - name: persistent-storage-0
      persistentVolumeClaim:
        claimName: ebs-claim-0
    - name: persistent-storage-1
      persistentVolumeClaim:
        claimName: ebs-claim-1
    - name: persistent-storage-2
      persistentVolumeClaim:
        claimName: ebs-claim-2
    - name: persistent-storage-3
      persistentVolumeClaim:
        claimName: ebs-claim-3
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: ebs-claim-0
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: ebs-sc
  resources:
    requests:
      storage: 4Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: ebs-claim-1
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: ebs-sc
  resources:
    requests:
      storage: 4Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: ebs-claim-2
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: ebs-sc
  resources:
    requests:
      storage: 4Gi
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: ebs-claim-3
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: ebs-sc
  resources:
    requests:
      storage: 4Gi
---
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: ebs-sc
provisioner: ebs.csi.aws.com
volumeBindingMode: WaitForFirstConsumer

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[github-actions]

Code Coverage Diff

This PR does not change the code coverage

[torredil]

/retest