Problems with release builds of keyboards for windows

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Cf e.g. https://github.com/giellalt/keyboard-crk/runs/15815612938

Nightly build works fine, and release build for macOS works fine.

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An update: it relates to both release and nightly builds, and not all windows builds. Search Zulip for recent windows keyboard build failures.

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Here's a typical error message from the logs:

C:\Users\task_169200409480956>python -u C:\Users\task_169200409480956\MwyQsvnnS7ad9TAowGDJEw\ci\runner.py C:\Users\task_169200409480956\MwyQsvnnS7ad9TAowGDJEw\MwyQsvnnS7ad9TAowGDJEw.json" 
Running clone
Running  ['pwsh', '-c', 'node ${HOME}/${TASK_ID}/_temp/actions/checkout/dist/index.js']
[WinError 2] The system cannot find the file specified
[WinError 2] The system cannot find the file specified
Traceback (most recent call last):
  File "C:\Users\task_169200409480956\MwyQsvnnS7ad9TAowGDJEw\ci\runner.py", line 585, in <module>
    asyncio.run(main())
  File "C:\Users\task_169200409480956\python3\lib\asyncio\runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "C:\Users\task_169200409480956\python3\lib\asyncio\base_events.py", line 641, in run_until_complete
    return future.result()
  File "C:\Users\task_169200409480956\MwyQsvnnS7ad9TAowGDJEw\ci\runner.py", line 570, in main
    await run_action(name, action)
  File "C:\Users\task_169200409480956\MwyQsvnnS7ad9TAowGDJEw\ci\runner.py", line 325, in run_action
    process = await asyncio.subprocess.create_subprocess_exec(
  File "C:\Users\task_169200409480956\python3\lib\asyncio\subprocess.py", line 218, in create_subprocess_exec
    transport, protocol = await loop.subprocess_exec(
  File "C:\Users\task_169200409480956\python3\lib\asyncio\base_events.py", line 1652, in subprocess_exec
    transport = await self._make_subprocess_transport(
  File "C:\Users\task_169200409480956\python3\lib\asyncio\windows_events.py", line 389, in _make_subprocess_transport
    transp = _WindowsSubprocessTransport(self, protocol, args, shell,
  File "C:\Users\task_169200409480956\python3\lib\asyncio\base_subprocess.py", line 36, in __init__
    self._start(args=args, shell=shell, stdin=stdin, stdout=stdout,
  File "C:\Users\task_169200409480956\python3\lib\asyncio\windows_events.py", line 885, in _start
    self._proc = windows_utils.Popen(
  File "C:\Users\task_169200409480956\python3\lib\asyncio\windows_utils.py", line 153, in __init__
    super().__init__(args, stdin=stdin_rfd, stdout=stdout_wfd,
  File "C:\Users\task_169200409480956\python3\lib\subprocess.py", line 966, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "C:\Users\task_169200409480956\python3\lib\subprocess.py", line 1435, in _execute_child
    hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
FileNotFoundError: [WinError 2] The system cannot find the file specified