The user_data field in the gitlab_unner role's config.toml template incorrectly double-encodes JSON content when using Ansible 2.19, causing the autoscaler configuration to fail.

The template line:

user_data = '{{ __ignition_content | to_json }}'

Produces incorrectly formatted output:

user_data = '"{\"ignition\":{\"version\":\"3.4.0\"},\"passwd\":{\"users\":[...]}}"'

This triple-wraps the JSON content:

1. TOML string wrapper ('...')
2. JSON string encoding ("...")
3. Escaped JSON content ({\"ignition\"...})

__ignition_content is already valid JSON from base64-decoding ignition.json. The | to_json filter double-encodes it, which Ansible 2.19's stricter template handling now rejects.