add finishing message

build_agent.cmd

@@ -49,8 +49,10 @@ go build -ldflags "-w -s" . >nul 2>&1
 if %errorlevel% NEQ 0 (
 	echo Something went wrong
 ) else (
-	echo Build successful:
-	dir agent.exe
+	echo Build successful
+	cd /D "%~dp0"
+	copy /y .\beszel\beszel\cmd\agent\agent.exe .
+	echo Beszel agent.exe was built and copied, you can proceed with 'install-beszel-service.cmd'.
 )
 
 :end