build.cmd: abort if interim step fails

So that it gets propagated properly and gets caught
by the CI build.

Author: webwarrior-ws

build.cmd

@@ -2,9 +2,9 @@
 rem change the target via -t, e.g.:
 rem build -t PackNuget
 cls
-dotnet tool restore
-dotnet paket restore
+dotnet tool restore || exit /b 1
+dotnet paket restore || exit /b 1
 rem set FAKE_SDK_RESOLVER_CUSTOM_DOTNET_VERSION=8.0
 rem Build with Fake or FSI:
-dotnet fake run build.fsx %*
+dotnet fake run build.fsx %* || exit /b 1
 rem dotnet fsi build.fsx %*