Add more robust error handling to all the sample build scripts

samples/RustIced/build.bat

@@ -12,9 +12,16 @@ cd %~dp0
 echo.
 echo Building Iced/Rust
 cargo build
+if errorlevel 1 exit /b 1
 
 echo.
 echo Building Velopack Release v%~1
+
 mkdir publish
+if errorlevel 1 exit /b 1
+
 move target\debug\velorusticedsample.exe publish\velorusticedsample.exe
-vpk pack -u VeloRustIcedSample -o releases -p publish -v %*
+if errorlevel 1 exit /b 1
+
+vpk pack -u VeloRustIcedSample -o releases -p publish -v %*
+if errorlevel 1 exit /b 1

samples/RustIced/build.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+set -e
 
 # Find the absolute path of the script
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"