The image "e2eteam/powershell-helper:6.2.7-linux-cache" is a Linux image. Because we're running "docker buildx build --platform windows/amd64", docker buildx will consider it as a Windows image unless we explicitly specify otherwise. If the image's platform is not correctly identified, we can run into problems when trying to build the image.
We are already doing something similar with the windows-servercore-cache image.
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