[WIP] Add a Docker image for Windows builds

windows/Dockerfile

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+# escape=`
+
+FROM mcr.microsoft.com/windows/servercore:1803
+
+# Install the Visual C++ Build tools
+#
+# Error code 3010 indicates a restart is required to complete installation, but
+# the command was otherwise successful.
+SHELL ["cmd", "/S", "/C"]
+ADD https://aka.ms/vs/15/release/vs_buildtools.exe C:\TEMP\vs_buildtools.exe
+RUN C:\TEMP\vs_buildtools.exe --quiet --wait --norestart --nocache `
+    --add "Microsoft.VisualStudio.Workload.VCTools"                `
+    --includeRecommended                                           `
+    || IF "%ERRORLEVEL%"=="3010" EXIT 0
+
+SHELL ["powershell", "-Command"]
+
+# Install vcpkg
+ADD https://github.com/Microsoft/vcpkg/archive/master.zip C:\TEMP\vcpkg-master.zip
+RUN $ErrorActionPreference = 'Stop';                                  `
+    Expand-Archive -Path C:\TEMP\vcpkg-master.zip -DestinationPath .; `
+    cd .\vcpkg-master;                                                `
+    .\bootstrap-vcpkg.bat;                                            `
+    .\vcpkg integrate install
+
+# Install packages
+COPY vc-packages.txt C:\
+RUN .\vcpkg-master\vcpkg install @(Get-Content C:\vc-packages.txt)
+
+CMD ["powershell.exe", "-NoLogo", "-ExecutionPolicy", "Bypass"]

windows/README.md

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+# Windows build environment for rust crates
+
+This repository contains the source of a Docker container the Rust project uses
+to build third-party crates on Windows. It is based on **Windows Server Core,
+version 1803**, and contains all the native dependencies used by the Rust
+crates we know of.
+
+## Dependencies
+
+All dependencies listed in `vc-packages.txt` will be installed into the
+image with `vcpkg`.
+
+## Using the docker image
+
+This image must be run on a Windows host with both containerization and Hyper-V
+enabled (Windows 10 Pro or Windows Server >=2016). If you wish to run `crater`
+on an Azure VM, this requires a virtual machine image tagged with "v3".
+
+
+Hyper-V can be enabled in [the GUI][hyperv] or in `Powershell` with:
+
+```powershell
+Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V -All
+```
+
+A reboot is required for this to take effect.
+
+[hyperv]: https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/quick-start/enable-hyper-v#enable-the-hyper-v-role-through-settings
+
+
+The Docker host must have a [build number][build] equal to that of the image
+you wish to run (presently `mcr.microsoft.com/windows/servercore:1803`).
+
+[Docker Desktop][] is required to run native Windows containers; this image
+will not work with Docker Toolbox. Once installed, ensure that Docker Desktop
+is configured to run Windows containers by right-clicking the icon in the
+dock, or by running the following in `Powershell`:
+
+```powershell
+$Env:ProgramFiles\Docker\Docker\DockerCli.exe -SwitchDaemon .
+```
+
+[Docker Desktop]: https://hub.docker.com/editions/community/docker-ce-desktop-windows
+[build]: https://docs.microsoft.com/en-us/virtualization/windowscontainers/deploy-containers/version-compatibility

windows/vc-packages.txt

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+zlib