Fix Windows dockerfile

Author: scheibling

windows.Dockerfile

@@ -1,7 +1,7 @@
 FROM mcr.microsoft.com/windows/nanoserver:ltsc2025
 
-WORKDIR C:\a
+WORKDIR C:\\a
 
-COPY goest.exe C:\a\goest.exe
+COPY goest.exe C:\\a\\goest.exe
 
-ENTRYPOINT [ "C:\a\goest.exe" ]
+ENTRYPOINT [ "C:\\a\\goest.exe" ]