Windows GitHub Action runners failing with `could not build module 'ucrt'`

Comienza con la ejecución vinculada de GitHub Actions y las definiciones de workflow de Windows en swiftlang/github-workflows. Reproduce los fallos de los módulos ucrt y _visualc_intrinsics en las versiones de Swift indicadas y compáralos con la solución alternativa de Docker. Se considerará terminado cuando las actions de Windows se ejecuten correctamente sin requerir Docker, incluidos los repositorios que no pueden realizar pruebas dentro de un contenedor.

The Windows GitHub actions on swift-format are failing with the following error (on 6.0, nightly, nightly-6.1). I think GitHub recently updated their Windows runners. Eg. https://github.com/swiftlang/swift-format/actions/runs/13572154457/job/38021583870

C:\Users\runneradmin\AppData\Local\Programs\Swift\Platforms\6.0.2\Windows.platform\Developer\SDKs\Windows.sdk\usr\lib\swift\shims/LibcOverlayShims.h:27:10: note: while building module 'ucrt' imported from C:\Users\runneradmin\AppData\Local\Programs\Swift\Platforms\6.0.2\Windows.platform\Developer\SDKs\Windows.sdk\usr\lib\swift\shims/LibcOverlayShims.h:27:
 25 | #endif
 26 | #if defined(_WIN32) && !defined(__CYGWIN__)
 27 | #include <errno.h>
    |          `- note: while building module 'ucrt' imported from C:\Users\runneradmin\AppData\Local\Programs\Swift\Platforms\6.0.2\Windows.platform\Developer\SDKs\Windows.sdk\usr\lib\swift\shims/LibcOverlayShims.h:27:
 28 | #include <io.h>
 30 | #if defined(__clang__) && (defined(_M_ARM64) || defined(_M_ARM64EC))
 31 | #include <arm_neon.h>
C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Tools\MSVC\14.43.34808\include\intrin.h:35:18: error: could not build module '_visualc_intrinsics'
  33 | 
  34 |     #if (defined (_M_IX86) || defined (_M_X64) || (defined(_M_ARM64) && defined(USE_SOFT_INTRINSICS))) && !defined(_CHPE_ONLY_) && (!defined(_M_ARM64EC) || !defined(_DISABLE_SOFTINTRIN_))
  35 |         #include <immintrin.h>
     |                  `- error: could not build module '_visualc_intrinsics'
  36 |         #include <ammintrin.h>
  37 |     #endif
<module-includes>:1:10: note: in file included from <module-includes>:1:
1 | #include "LibcOverlayShims.h"
  |          `- note: in file included from <module-includes>:1:
2 | 
<unknown>:0: error: could not build C module 'SwiftOverlayShims'
C:\Users\runneradmin\AppData\Local\Programs\Swift\Platforms\6.0.2\Windows.platform\Developer\SDKs\Windows.sdk\usr\lib\swift\shims/LibcOverlayShims.h:27:10: error: could not build module 'ucrt'
 25 | #endif
 26 | #if defined(_WIN32) && !defined(__CYGWIN__)
 27 | #include <errno.h>
    |          `- error: could not build module 'ucrt'
 28 | #include <io.h>
 29 | typedef int mode_t;

I was able to work around this by running tests inside Docker container on Windows again but that adds 5-10 minutes to CI time and eg. the VS Code extension repo can’t run their tests inside a Docker container.