Running calibre on Alpine Linux?

Hello; I'm working on trying to get Calibre running in an Alpine Linux Docker container.

My current Dockerfile command looks like this (run as root):

FROM alpine
RUN apk update && apk add --upgrade ca-certificates python wget gcc xdg-utils xz && wget -O- https://raw.githubusercontent.com/ko...x-installer.py | python -c "import sys; main=lambda:sys.stderr.write('Download failed\n'); exec(sys.stdin.read()); main()"

Most of it is just running the installation recipe with the instructions found here: https://calibre-ebook.com/download_linux

What is weird is that this places executables in /opt/calibre, but then when the installer tries to run them, the OS reports them as not existing. Their permissions are all rwx for everyone.

I was curious if anyone had gotten calibre to run under Alpine Linux. Thanks.