curl --request POST \
  --url https://app.laravel.cloud/api/environments/{environment}/variables \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "method": "append",
  "variables": [
    {
      "key": "<string>",
      "value": "<string>"
    }
  ]
}'

{
  "data": {
    "id": "<string>",
    "type": "environments",
    "attributes": {
      "name": "<string>",
      "slug": "<string>",
      "status": "deploying",
      "created_from_automation": true,
      "vanity_domain": "<string>",
      "php_major_version": "8.2",
      "build_command": "<string>",
      "node_version": "20",
      "deploy_command": "<string>",
      "uses_web_server": true,
      "uses_octane": true,
      "uses_hibernation": true,
      "uses_push_to_deploy": true,
      "uses_deploy_hook": true,
      "environment_variables": [
        {
          "key": "<string>",
          "value": "<string>"
        }
      ],
      "network_settings": {
        "cache": {
          "strategy": "<string>"
        },
        "response_headers": {
          "frame": "<string>",
          "content_type": "<string>",
          "hsts": {
            "max_age": 123,
            "include_subdomains": true,
            "preload": true
          }
        },
        "firewall": {
          "bot_categories": [
            "academic_research"
          ],
          "rate_limit": {
            "429": true,
            "level": "challenge",
            "per_minute": 100,
            "4xx": true
          },
          "under_attack_mode_started_at": "<string>"
        }
      },
      "created_at": "2023-11-07T05:31:56Z"
    },
    "relationships": {
      "application": {
        "data": {
          "type": "applications",
          "id": "<string>"
        }
      },
      "branch": {
        "data": {
          "type": "branches",
          "id": "<string>"
        }
      },
      "deployments": {
        "data": [
          {
            "type": "deployments",
            "id": "<string>"
          }
        ]
      },
      "currentDeployment": {
        "data": {
          "type": "deployments",
          "id": "<string>"
        }
      },
      "domains": {
        "data": [
          {
            "type": "domains",
            "id": "<string>"
          }
        ]
      },
      "primaryDomain": {
        "data": {
          "type": "domains",
          "id": "<string>"
        }
      },
      "instances": {
        "data": [
          {
            "type": "instances",
            "id": "<string>"
          }
        ]
      }
    },
    "links": {
      "self": {
        "href": "<string>",
        "rel": "<string>",
        "describedby": "<string>",
        "title": "<string>",
        "type": "<string>",
        "hreflang": "<string>",
        "meta": {}
      }
    }
  }
}