I managed to put together a Dockerfile that seemingly has the build tools installed (https://github.com/jaraco/jaraco.windows/blob/d2edad2e2af9d469189d7ac6a14a4ba6f6270348/Dockerfile).

When I attempt to build CPython, however, it fails with this error:

```
PS C:\code\public\cpython> PCBuild\build.bat
Using py -3.9 (found 3.9 with py.exe)
Fetching external libraries...
bzip2-1.0.6 already exists, skipping.
sqlite-3.35.5.0 already exists, skipping.
xz-5.2.2 already exists, skipping.
zlib-1.2.11 already exists, skipping.
Fetching external binaries...
libffi already exists, skipping.
openssl-bin-1.1.1k-1 already exists, skipping.
tcltk-8.6.11.0 already exists, skipping.
Finished.
Using "C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\MSBuild\Current\Bin\MSBuild.exe"  (found in the PATH)
Using py -3.9 (found 3.9 with py.exe)

C:\code\public\cpython>"C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\MSBuild\Current\Bin\MSBuild.exe"  "C:\code\public\cpython\PCbuild\pcbuild.proj" /t:Build /m /nologo /v:m /clp:summary /p:Configuration=Release /p:Platform=x64 /p:IncludeExternals=true /p:IncludeCTypes=true /p:IncludeSSL=true /p:IncludeTkinter=true /p:UseTestMarker= /p:GIT="C:\Program Files\Git\cmd\git.exe"
C:\code\public\cpython\PCbuild\python.props(111,31): error MSB4184: The expression "[System.Version]::Parse('')" cannot be evaluated. Version string portion was too short or too long. [C:\code\public\cpython\PCbuild\pythoncore.vcxproj]

Build FAILED.

C:\code\public\cpython\PCbuild\python.props(111,31): error MSB4184: The expression "[System.Version]::Parse('')" cannot be evaluated. Version string portion was too short or too long. [C:\code\public\cpython\PCbuild\pythoncore.vcxproj]
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:00.15
```