Fix PrependPath format to be array instead of a concatenated string (#1948)

* Fix prependPath format

src/Runner.Worker/Container/ContainerHooks/ContainerHookManager.cs

@@ -101,7 +101,7 @@ namespace GitHub.Runner.Worker.Container.ContainerHooks
                     EntryPointArgs = entryPointArgs.Split(' ').Select(arg => arg.Trim()),
                     EntryPoint = entryPoint,
                     EnvironmentVariables = environmentVariables,
-                    PrependPath = prependPath,
+                    PrependPath = context.Global.PrependPath.Reverse<string>(),
                     WorkingDirectory = workingDirectory,
                 },
                 State = context.Global.ContainerHookState

src/Runner.Worker/Container/ContainerHooks/HookInput.cs

@@ -44,7 +44,7 @@ namespace GitHub.Runner.Worker.Container.ContainerHooks
         public IEnumerable<string> EntryPointArgs { get; set; }
         public string EntryPoint { get; set; }
         public IDictionary<string, string> EnvironmentVariables { get; set; }
-        public string PrependPath { get; set; }
+        public IEnumerable<string> PrependPath { get; set; }
         public string WorkingDirectory { get; set; }
         public bool IsRequireAlpineInResponse() => false;
     }