[Farmware] ImageUploader does not ensure images directory exists

[gabrielburnworth]

FarmBot OS version

8.0.0-rc26

To reproduce

Install and run a Farmware that saves an image to the image upload directory. For example, https://raw.githubusercontent.com/FarmBot-Labs/farmware_manifests/master/packages/take-photo/manifest_v2.json with a camera plugged in.

Relevant code

https://github.com/FarmBot/farmbot_os/blob/staging/farmbot_ext/lib/farmbot_ext/api/image_uploader.ex

(On the master branch, the directory was created via a mkdir_p call: https://github.com/FarmBot/farmbot_os/blob/1fe52021c71bfe068c2be09bd8ded99c211804f6/lib/farmbot/http/image_uploader.ex)