based on https://community.atlassian.com/t5/Bitbucket-questions/How-do-I-create-a-docker-image-for-Bitbucket-Pipelines/qaq-p/334724
I am attempting to set up a Bitbucket Pipeline for a Windows image (since we are using IAR embedded workbench as our build environment - https://www.iar.com/iar-embedded-workbench/ )
in my bitbucket account, I have pipelines enabled

I have a Docker hub account at https://hub.docker.com
I have installed docker on my Windows machine
I have created, at my local root C:\, a docker directory and created a trivial Dockerfile at C:\docker

I used PowerShell and built a docker image

I logged into my hub.docker.com account

I push the image to Docker hub

I specify the image in my bitbucket-pipelines.yml
The problem is that the build gives me the following error

what do I need to do so that the build for this trivial case passes? do I need to switch the server from linux to Windows? if so, how do I do that from within the Bitbucket environment?