Why dita-ot-action fails on Windows runner?

[syeda-git]

Hello,
I am setting up GitHub Actions on GHE server for dita builds. After crossing many hoops, i seem to be getting this error:
'Container action is only supported on Linux'
Am assuming it's because dita-ot-actions repo uses 'docker' for the build? If that's correct, how can i use a Windows runner in Actions to run a dita build?

The workflow:
name: CI
'on':
push:
branches:
- master
jobs:
build-dita:
name: Build DITA
runs-on: self-hosted
steps:
- name: Git checkout
uses: UA-PNP/checkout-action@main
- name: Build HTML5
uses: UA-PNP/dita-ot-action@main
with:
build: |
dita -i notes12/notes.ditamap -o out -f html5

[syeda-git]

@jason-fox Can you shed some light on this issue? I have cloned the dita-ot-action repo in my GitHub Enterprise Server. The runner is self-hosted on my Windows laptop. Are there equivalent Windows files for dita-ot-action?

[jason-fox]

The dita-ot-action is a Docker container Action. From: https://docs.github.com/en/actions/creating-actions/about-custom-actions

Docker container actions can only execute on runners with a Linux operating system. Self-hosted runners must use
a Linux operating system and have Docker installed to run Docker container actions. For more information about the
requirements of self-hosted runners, see "About self-hosted runners."