feat(chart): add extraVolumes + extraVolumeMounts

[tamcore]

Pull Request

What? (description)

Adds extraVolumes / extraVolumeMounts parameters to the Helm chart.

Why? (reasoning)

Allows to, for example, mount a custom CA to /etc/ssl/certs/ca-certificates.crt, to avoid having to use insecure: true.

Fixes #65.

Acceptance

Please use the following checklist:

• you linked an issue (if applicable)
• you included tests (if applicable)
• you linted your code (make lint)
• you linted your code (make unit)

See make help for a description of the available targets.

[sergelogvinov]

Thank you!

[konstantin-kornienko]

@tamcore , @sergelogvinov , maybe you guys can help with some adivce?
Trying to inject custom CA with helm:

extraVolumes:
  - name: ca
    secret:
      secretName: secret

extraVolumeMounts:
  - mountPath: /etc/ssl/certs/ca-certificates.crt
    name: ca
    subPath: ca.crt

got 1 pod (controller) failed:

 Error: failed to create containerd task: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: error during container init: error mounting "/var/lib/kubelet/pods/9638f0cf-2012-4f64-a880-33 │
│ 5a785c7ad5/volume-subpaths/ca/proxmox-csi-plugin-controller/2" to rootfs at "/etc/ssl/certs/ca-certificates.crt": mount /var/lib/kubelet/pods/9638f0cf-2012-4f64-a880-335a785c7ad5/volume-subpaths/ca/proxmox-csi-plugin-controller/2:/etc/ssl/certs/ca-certificates.crt (via /proc/self/fd/6), flags: 0x5001: not a directory: unknown                                                                                                    

my config:

config:
  clusters:
    - url: https://proxmox.example.com:443/api2/json
      insecure: false
      token_id: "id"
      token_secret: "secret"
      region: main

extraVolumes:
  - name: ca
    secret:
      secretName: secret

extraVolumeMounts:
  - mountPath: /etc/ssl/certs/ca-certificates.crt
    name: ca
    subPath: ca.crt

storageClass:
  - name: proxmox-data-xfs
    storage: data
    reclaimPolicy: Delete
    fstype: xfs