Also build the iot library in the same step

eng/ArduinoCsCI.cmd

@@ -16,15 +16,18 @@ arduino-cli config init
 arduino-cli config add board_manager.additional_urls https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json
 arduino-cli core update-index
 
+build.cmd -ci -configuration %2 -preparemachine
+
 set ArduinoRootDir=%1\Documents\Arduino
 set acspath=%~dp0\..\tools\ArduinoCsCompiler\Frontend\bin\%2\net6.0\acs.exe
 
 git clone https://github.com/firmata/ConfigurableFirmata %ArduinoRootDir%\libraries\ConfigurableFirmata
 git clone https://github.com/pgrawehr/ExtendedConfigurableFirmata %ArduinoRootDir%\ExtendedConfigurableFirmata
 arduino-cli core install esp32:esp32
 
+git branch --list "*main"
 REM Check whether any compiler files have changed - if so, enable the (long running) compiler tests
-git diff --name-status origin/main | find /C /I "tools/ArduinoCsCompiler"
+git diff --name-status main | find /C /I "tools/ArduinoCsCompiler"
 REM Find returns 1 when the string was NOT found, we want to set the variable to true when it does find something
 if %errorlevel%==0 set RUN_COMPILER_TESTS=TRUE