Sample Unity Editor Build Post-Process Step to handle Burst generated code on OSX

MacBurst.cs

using System.IO;
using System.Reflection;
using UnityEditor;
using UnityEditor.Build;
using UnityEditor.Build.Content;
using UnityEditor.Build.Reporting;
using UnityEditor.iOS.Xcode;
using UnityEngine;

public static class PBXProjExt
{
    public static string GetGuidForOSXTarget( this PBXProject proj )
    {
        return proj.TargetGuidByName(Application.productName);
    }

    public static void SetSignOnCopyFlag(this PBXProject proj, string targetguid, string fileguid )
    {
        var method = proj.GetType().GetMethod("BuildFilesGetForSourceFile", BindingFlags.NonPublic | BindingFlags.Instance );
        var filedata = method.Invoke( proj,new object[] {targetguid, fileguid});
        var filedataType = filedata.GetType();
        var field = filedata.GetType().GetField("codeSignOnCopy");
        if (field != null)
        {
            field.SetValue( filedata, true );
        }
    }    
    
    public static string GetPhaseByName(this PBXProject proj, string phaseName )
    {
        var phases = proj.GetAllBuildPhasesForTarget(proj.GetGuidForOSXTarget());
        foreach (var phaseguid in phases)
        {
            var name = proj.GetBuildPhaseName(phaseguid);
            if (name.Equals(phaseName))
                return phaseguid;
        }

        return null;
    }    

    public static string GetCopyPluginsPhase(this PBXProject proj)
    {
        return GetPhaseByName(proj, @"CopyPlugIns" );
    }
}

class MacBurst : IPostprocessBuildWithReport
{
    public int callbackOrder { get { return 0; } }

    string GetProjectName( string projectPath )
    {
        return Path.GetFileName(projectPath);
    }

    string GetProductName()
    {
        return Application.productName;
    }

    public void OnPostprocessBuild(BuildReport report)
    {
        if (report.summary.platform == BuildTarget.StandaloneOSX)
        {
            string projectName = GetProjectName(report.summary.outputPath);
            string projectPath = Path.Combine( report.summary.outputPath, $"{projectName}.xcodeproj/project.pbxproj" );

            PBXProject project = new PBXProject();
            if (File.Exists(projectPath))
            {
                var rawproj = File.ReadAllText(projectPath);
                project.ReadFromString( rawproj );

                string macBurstBundlePath = Path.Combine(report.summary.outputPath,
                    $"{projectName}/Contents/Plugins/lib_burst_generated.bundle");
                
                if (File.Exists(macBurstBundlePath))
                {
                    var burstfile = project.AddFile(macBurstBundlePath, $"{GetProductName()}/PlugIns/lib_burst_generated.bundle", PBXSourceTree.Source );
                    project.AddFileToBuildSection( project.GetGuidForOSXTarget(), project.GetCopyPluginsPhase(), burstfile );
                    project.SetSignOnCopyFlag(project.GetGuidForOSXTarget(),burstfile);
                }
            
                var fixedproj = project.WriteToString();
                File.WriteAllText( projectPath,fixedproj );
            }

        }
    }
}