Add build script

install-beszel-service.cmd

@@ -11,7 +11,7 @@ set AGENTEXE=%DESTINATIONDIR%\agent.exe
 set NSSMEXE=nssm.exe
 
 where nssm.exe >nul 2>&1
-if %errorlevel%==1 goto installnssm
+if %errorlevel% NEQ 0 goto installnssm
 goto proceed
 
 :installnssm
@@ -42,21 +42,21 @@ netsh advfirewall firewall add rule name="%SERVICENAME%" dir=in action=allow pro
 
 echo Installing service %SERVICENAME%
 %NSSMEXE% install %SERVICENAME% "%AGENTEXE%" >nul 2>&1
-if %errorlevel%==1 (
+if %errorlevel% NEQ 0 (
 	echo Failed to install the service.
 	goto end
 )
 
 echo Setting environment for %SERVICENAME%
 %NSSMEXE% set %SERVICENAME% AppEnvironmentExtra "KEY=%BESZELKEYPREFIX% %BESZELKEY%" >nul 2>&1
-if %errorlevel%==1 (
+if %errorlevel% NEQ 0 (
 	echo Failed to set the service environment.
 	goto end
 )
 
 echo Starting %SERVICENAME%
 %NSSMEXE% start %SERVICENAME% >nul 2>&1
-if %errorlevel%==1 (
+if %errorlevel% NEQ 0 (
 	echo Failed to start service.
 	goto end
 )