a.yaml

version: v1.1.0
steps:
  - build: -t $Registry/mnasonov --platform windows .
    env:
      - DOCKER_BUILDKIT=1
      - ABC={{.Values.abc}}
  - push:
    - $Registry/mnasonov:latest

Dockerfile

FROM mcr.microsoft.com/dotnet/framework/sdk:4.8-20230516-windowsservercore-ltsc2019

SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop';$ProgressPreference='silentlyContinue';"]
RUN Write-Output 555
RUN --mount=type=secret,id=token,required=true dir C:\ProgramData\Docker\secrets