BUG: "Set Terraform versions fact" should return a list, not a string

[AlexCK-STFC]

For some reason, perhaps an upstream change, terraform_available_versions was resulting in a string of a list when no versions are available.

Closes #25

[AlexCK-STFC]

Fix works as per log:

Using /home/ubuntu/azimuth/cloud-azimuth-config/environments/stfc-dev/ansible.cfg as config file
running playbook inside collection azimuth_cloud.azimuth_ops

PLAY [Provision seed node using OpenTofu] **************************************

TASK [Gathering Facts] *********************************************************
ok: [localhost]

TASK [Install Terraform] *******************************************************
included: azimuth_cloud.terraform.install for localhost

TASK [azimuth_cloud.terraform.install : Check if Terraform binary exists in search directories] ***
ok: [localhost] => (item=/home/ubuntu/azimuth/cloud-azimuth-config/.bin) => {"ansible_loop_var": "item", "changed": false, "item": "/home/ubuntu/azimuth/cloud-azimuth-config/.bin", "stat": {"exists": false}}
ok: [localhost] => (item=/home/ubuntu/azimuth/cloud-azimuth-config/.venv/bin) => {"ansible_loop_var": "item", "changed": false, "item": "/home/ubuntu/azimuth/cloud-azimuth-config/.venv/bin", "stat": {"exists": false}}
ok: [localhost] => (item=/usr/local/sbin) => {"ansible_loop_var": "item", "changed": false, "item": "/usr/local/sbin", "stat": {"exists": false}}
ok: [localhost] => (item=/usr/local/bin) => {"ansible_loop_var": "item", "changed": false, "item": "/usr/local/bin", "stat": {"exists": false}}
ok: [localhost] => (item=/usr/sbin) => {"ansible_loop_var": "item", "changed": false, "item": "/usr/sbin", "stat": {"exists": false}}
ok: [localhost] => (item=/usr/bin) => {"ansible_loop_var": "item", "changed": false, "item": "/usr/bin", "stat": {"exists": false}}
ok: [localhost] => (item=/sbin) => {"ansible_loop_var": "item", "changed": false, "item": "/sbin", "stat": {"exists": false}}
ok: [localhost] => (item=/bin) => {"ansible_loop_var": "item", "changed": false, "item": "/bin", "stat": {"exists": false}}
ok: [localhost] => (item=/usr/games) => {"ansible_loop_var": "item", "changed": false, "item": "/usr/games", "stat": {"exists": false}}
ok: [localhost] => (item=/usr/local/games) => {"ansible_loop_var": "item", "changed": false, "item": "/usr/local/games", "stat": {"exists": false}}
ok: [localhost] => (item=/snap/bin) => {"ansible_loop_var": "item", "changed": false, "item": "/snap/bin", "stat": {"exists": false}}

TASK [azimuth_cloud.terraform.install : Get available Terraform versions] ******
skipping: [localhost] => {"changed": false, "skipped_reason": "No items in the list"}

TASK [azimuth_cloud.terraform.install : Set Terraform versions fact] ***********
ok: [localhost] => {"ansible_facts": {"terraform_available_versions": []}, "changed": false}

TASK [azimuth_cloud.terraform.install : Filter Terraform versions] *************
ok: [localhost] => {"ansible_facts": {"terraform_acceptable_versions": []}, "changed": false}

TASK [azimuth_cloud.terraform.install : Set Terraform binary path] *************
skipping: [localhost] => {"changed": false, "false_condition": "terraform_acceptable_versions | length > 0", "skip_reason": "Conditional result was False"}

TASK [azimuth_cloud.terraform.install : Show terraform_binary_path] ************
skipping: [localhost] => {"false_condition": "terraform_binary_path is defined"}

TASK [azimuth_cloud.terraform.install : Ensure Terraform bin directory exists] ***
changed: [localhost] => {"changed": true, "gid": 1000, "group": "ubuntu", "mode": "0755", "owner": "ubuntu", "path": "/home/ubuntu/azimuth/cloud-azimuth-config/.bin", "size": 4096, "state": "directory", "uid": 1000}

TASK [azimuth_cloud.terraform.install : Download Terraform binary] *************
changed: [localhost] => {"changed": true, "dest": "/home/ubuntu/azimuth/cloud-azimuth-config/.bin", "extract_results": {"cmd": ["/usr/bin/unzip", "-o", "/home/ubuntu/.ansible/tmp/ansible-tmp-1753792941.3058896-29950-243779711352623/tofu_1.9.1_linux_amd646v09k7rx.zip", "-d", "/home/ubuntu/azimuth/cloud-azimuth-config/.bin"], "err": "", "out": "Archive:  /home/ubuntu/.ansible/tmp/ansible-tmp-1753792941.3058896-29950-243779711352623/tofu_1.9.1_linux_amd646v09k7rx.zip\n  inflating: /home/ubuntu/azimuth/cloud-azimuth-config/.bin/CHANGELOG.md  \n  inflating: /home/ubuntu/azimuth/cloud-azimuth-config/.bin/LICENSE  \n  inflating: /home/ubuntu/azimuth/cloud-azimuth-config/.bin/README.md  \n  inflating: /home/ubuntu/azimuth/cloud-azimuth-config/.bin/tofu  \n", "rc": 0}, "gid": 1000, "group": "ubuntu", "handler": "ZipArchive", "mode": "0755", "owner": "ubuntu", "size": 4096, "src": "/home/ubuntu/.ansible/tmp/ansible-tmp-1753792941.3058896-29950-243779711352623/tofu_1.9.1_linux_amd646v09k7rx.zip", "state": "directory", "uid": 1000}

TASK [azimuth_cloud.terraform.install : Set current Terraform path fact] *******
ok: [localhost] => {"ansible_facts": {"terraform_binary_path": "/home/ubuntu/azimuth/cloud-azimuth-config/.bin/tofu"}, "changed": false}

TASK [azimuth_cloud.terraform.install : Display Terraform path and version message] ***
ok: [localhost] => {
    "msg": "Using Terraform version 1.9.1 from /home/ubuntu/azimuth/cloud-azimuth-config/.bin/tofu."
}

[AlexCK-STFC]

I believe this was broken by ansible-core 2.19

Core 2.19 introduces major changes, should it be rejected for now in requirements?

requirements.txt allows "ansible-core>=2.12"