Add support for LINODE_CA env var and api_ca_path attribute

[zliang-akamai]

📝 Description

Similar to the Terraform PR linode/terraform-provider-linode#1614, adding support for LINODE_CA environment var and api_ca_path attribute in our packer plugin.

✔️ How to Test

Automated Testing (CA test not included)

make test

Manual Testing

Put this content in a file called test.pkr.hcl

locals { timestamp = regex_replace(timestamp(), "[- TZ:]", "") }

source "linode" "example" {
  image             = "linode/debian11"
  image_description = "My Private Image"
  image_label       = "private-image-${local.timestamp}"
  instance_label    = "temporary-linode-${local.timestamp}"
  instance_type     = "g6-nanode-1"
  region            = "us-east"
  ssh_username      = "root"
  api_ca_path       = "/path/to/your/ca.pem"

  interface {
    purpose = "public"
  }
}

build {
  sources = ["source.linode.example"]
}

make dev
packer build .

[ezilber-akamai]

Nice work! Everything is working as expected locally.

[ykim-akamai]

LGTM, tests and manual steps are passing locally