feat: Elevator evergreen content

[cmaddox5]

Adds evergreen content support on elevator screens. Assuming Screens.Util.Assets.s3_asset_url/1 points at the screens-dev-green bucket, you can use the following config to test:

{
  "ELE-101": {
    "disabled": false,
    "name": "",
    "app_id": "elevator_v2",
    "app_params": {
      "evergreen_content": [
        {
          "priority": [0],
          "slot_names": ["header"],
          "asset_path": "images/elevator/header_test.png",
          "schedule": [
            {
              "start_dt": null,
              "end_dt": null
            }
          ],
          "text_for_audio": null,
          "audio_priority": null
        },
        {
          "priority": [0],
          "slot_names": ["main_content"],
          "asset_path": "images/elevator/main_content_test.png",
          "schedule": [
            {
              "start_dt": null,
              "end_dt": null
            }
          ],
          "text_for_audio": null,
          "audio_priority": null
        },
        {
          "priority": [0],
          "slot_names": ["footer"],
          "asset_path": "images/elevator/footer_test.png",
          "schedule": [
            {
              "start_dt": null,
              "end_dt": null
            }
          ],
          "text_for_audio": null,
          "audio_priority": null
        }
      ],
      "elevator_id": "842",
      "alternate_direction_text": "Alternate direction text goes here. This is the largest body text class. Use this for shorter sets of directions. Add up to 6 lines at this size",
      "accessible_path_image_url": "images/elevator/maps/forest-hills-map.png",
      "accessible_path_direction_arrow": "e",
      "accessible_path_image_here_coordinates": {
        "x": 151,
        "y": 182
      }
    },
    "device_id": "",
    "hidden_from_screenplay": false,
    "refresh_if_loaded_before": null,
    "tags": [],
    "vendor": "mimo"
  }
}

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[digitalcora]

🌲

[digitalcora]

I'm confused as to how this works. header_ and footer_instance return a single widget struct, which is not an enumerable, and Enum.concat/1 expects an enum of enums. Doing the equivalent of this call in IEx results in an error:

iex(1)> Enum.concat([:a, :b, [:c, :d], [:e, :f]])
** (Protocol.UndefinedError) protocol Enumerable not implemented for :a of type Atom
    (elixir 1.15.7) lib/enum.ex:1: Enumerable.impl_for!/1
    (elixir 1.15.7) lib/enum.ex:166: Enumerable.reduce/3
    (elixir 1.15.7) lib/enum.ex:4387: anonymous fn/3 in Enum.concat_enum/1
    (elixir 1.15.7) lib/enum.ex:2510: Enum."-concat_enum/1-lists^foldl/2-1-"/3
    (elixir 1.15.7) lib/enum.ex:2510: Enum.concat_enum/1
    iex:1: (file)

[digitalcora]

*cough*

[cmaddox5]

🫥