Windows Desktop Client CI (#2)

Adds a windows container build and a windows client build.
Outstanding issues:
- I'm not sure if `workflow_dispatch` works. Based on [this PR](https://github.com/go-gitea/gitea/pull/28163) it seems like it should, but I don't see a button. It might only work after merging into the default branch.
- The windows build container is building dioxus from git HEAD because there is an unreleased bugfix we are depending on. We should revert this to a versioned release (maybe using `binstall`) once they cut 0.7.2

Reviewed-on: #2

docker/windows-release-builder.Dockerfile

@@ -0,0 +1,53 @@
+# escape=`
+
+# Use a Windows Server Core 2025 image that matches our build host.
+# If the version doesn't match the build host we cannot run
+# this container. I'm not sure with what specificity it has to
+# match, so let's pin this and then upgrade it as we upgrade
+# the host.
+FROM mcr.microsoft.com/windows/servercore:10.0.26100.7171
+
+ENV CMAKE_VERSION=3.31.10
+ENV CMAKE_ARCH=windows-x86_64
+
+# Restore the default Windows shell for correct batch processing.
+SHELL ["cmd", "/S", "/C"]
+
+RUN curl -SL --output vs_buildtools.exe https://aka.ms/vs/17/release/vs_buildtools.exe `
+  && ( start /w vs_buildtools.exe --quiet --wait --norestart --nocache `
+  --installPath "%ProgramFiles(x86)%\Microsoft Visual Studio\2022\BuildTools" `
+  --add Microsoft.VisualStudio.Component.VC.Tools.x86.x64 `
+  --add Microsoft.VisualStudio.Component.Windows10SDK.19041 `
+  --add Microsoft.VisualStudio.Workload.NativeDesktop `
+  || IF "%ERRORLEVEL%"=="3010" EXIT 0 )
+
+SHELL ["powershell", "-NoLogo", "-ExecutionPolicy", "Bypass", "-Command"]
+
+RUN $ErrorActionPreference = 'Stop'; `
+  $url = \"https://github.com/Kitware/CMake/releases/download/v$env:CMAKE_VERSION/cmake-$env:CMAKE_VERSION-$env:CMAKE_ARCH.zip\"; `
+  $out = 'C:\\cmake.zip'; `
+  (New-Object System.Net.WebClient).DownloadFile($url, $out); `
+  Expand-Archive -Path $out -DestinationPath 'C:\\'; `
+  Remove-Item $out; `
+  $cmakeDir = \"C:\\cmake-$env:CMAKE_VERSION-$env:CMAKE_ARCH\\bin\"; `
+  [Environment]::SetEnvironmentVariable('PATH', $cmakeDir + ';' + $env:PATH, 'Machine')
+
+# Install Chocolatey
+RUN Set-ExecutionPolicy Bypass -Scope Process; `
+  [System.Net.ServicePointManager]::SecurityProtocol = `
+  [System.Net.SecurityProtocolType]::Tls12; `
+  iex ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))
+
+RUN choco install git -y --no-progress
+RUN choco install rustup.install -y --no-progress
+
+RUN rustup toolchain install stable-x86_64-pc-windows-msvc
+RUN rustup default stable-x86_64-pc-windows-msvc
+
+SHELL ["C:\\Program Files (x86)\\Microsoft Visual Studio\\2022\\BuildTools\\Common7\\Tools\\VsDevCmd.bat", "&&", "powershell.exe", "-NoLogo", "-ExecutionPolicy", "Bypass"]
+# Install dioxus-cli from git HEAD with cargo
+# This is to work around a bug in the windows builder upstream.
+# Dioxus has released 0.7.2, but it seems to be broken for now.
+RUN cargo install --git https://github.com/DioxusLabs/dioxus dioxus-cli
+
+ENTRYPOINT ["C:\\Program Files (x86)\\Microsoft Visual Studio\\2022\\BuildTools\\Common7\\Tools\\VsDevCmd.bat", "&&", "powershell.exe", "-NoLogo", "-ExecutionPolicy", "Bypass"]