hotfix(Windows Server Core LTSC2019) pin 2019 images to April version #816
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Until microsoft/Windows-Containers#493 is fixed, we want to use April Windows Server Core 2019 version to avoid errors as in #815
This PR adds a new
WINDOWS_VERSION_DIGEST
build argument to allow using a specific image digest (Docker image naming supports both tags and digest with the digest taking priority over tag since Moby 20.10.20) in order to pin parent image version as a workaround for a few weeks.