Alpine Linux for Kindle v0.1
Here you can obtain a pre-built image of Alpine for Kindle (Alpine snapshot from 2019-08-14, made with create_kindle_alpine_image.sh at default settings). Extract alpine.zip to get the required alpine.ext3 image. You can clone/download the source code to get alpine.sh and alpine.conf as well.
Please have a look at the Step-by-Step guid on how to install it.