Example Unreal Engine 4/5 Build.cs script that automatically fetches the current Perforce changelist and embeds it into code

GetP4Changelist.cs

// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.

using System;
using UnrealBuildTool;
using System.Diagnostics;

public class BuildScriptUtils
{
    // Runs p4.exe to determine the current changelist
    // Returns true if it could determine the changelist, false if not
    // The out changelist parameter is the current changelist, or 0.
    public static bool GetP4Changelist(out int changelist)
    {
        // Connection constants
        const string P4_IP = "your-p4-server.com:1666";
        const string P4_USER = "username";
        const string P4_PASS = "password";
        
        // Default value for the changelist
        changelist = 0;
        
        // Try to get the last line the process output
        try
        {
            // Try to obtain the current P4 changelist by running p4.exe
            Process process = new Process();
            process.StartInfo.FileName = "p4.exe";
            process.StartInfo.Arguments = "-p " + P4_IP + " -u " + P4_USER + " -P " + P4_PASS + " changes -m 1 -s submitted";
            process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.RedirectStandardOutput = true;
            process.Start();
            process.WaitForExit();
	
            // The response of the command above looks like this:
            //   Change 420 on 2022/08/02 by User@Workspace 'Some changelist message'
            string changelistStr = process.StandardOutput.ReadLine();
            if (changelistStr != null && changelistStr.Length > 0)
            {
                // Remove the "Change " at the beginning and then take the first string
                changelistStr = changelistStr.Substring("Change ".Length);
                changelistStr = changelistStr.Split(' ')[0];

                // Parse as int
                changelist = int.Parse(changelistStr);
                
                // Debug print
                Console.WriteLine("Determined P4 changelist: " + changelist);
                
                return true;
            }
            else
            {
                throw new Exception();
            }
        }
        catch (Exception e)
        {
            // Catch any exception and just return false
	        Console.WriteLine("Error determining P4 changelist!");
            return false;
        }
    }
}

public class ExampleProject : ModuleRules
{
	public ExampleProject(ReadOnlyTargetRules Target) : base(Target)
	{
		PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;

        // Public modules used by the game
		PublicDependencyModuleNames.AddRange(new string[] {
            "Core",
            "CoreUObject",
            "Engine",
            "InputCore"
        });

        // Get the current P4 changelist and set it as a code definition
        int changelist = 0;
        if (BuildScriptUtils.GetP4Changelist(out changelist))
        {
            // Save it as a definition so the game can access it
            PublicDefinitions.Add("PROJECT_CL=" + changelist);
        }
    }
}

Is there a way to run the p4 process without hard coding your password in code?