feat: block_volume

[Codelax]

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Description

Add attributes to create or import block volumes when starting build instance

Potential configuration

source "scaleway" "basic" {
  commercial_type = "DEV1-S"
  image = "ubuntu_jammy"
  image_name = "image-name"
  ssh_username = "root"
  zone = "fr-par-1"
  remove_volume = true

  block_volumes {
    name = optional_or_generated
    size = 20
  }
  block_volumes {
    name = optional_or_generated
    snapshot_id = xxxx-xxxx-xxxx-xxxx
  }
}

block_volumes would be deleted if using remove_volume option

Potential References

To fix beforehand: #86

[Laure-di]

Currently on hold: Block volume management will be handled by the storage API instead of the instance.