SlackにBuild通知を投げる tokenにアプリのtokenを設定する

SlackNotificationOnBuildFinish.cs

using System;
using System.Collections;
using System.Text;
using Unity.EditorCoroutines.Editor;
using UnityEditor;
using UnityEditor.Callbacks;
using UnityEngine;
using UnityEngine.Networking;

namespace BuildProcess
{
    public class SlackNotificationOnBuildFinish
    {
        public class Payload
        {

            public string text;
            public string type = "mrkdwn";
        }
        [PostProcessBuild(212)]
        public static void OnBuildFinish(BuildTarget target, string pathToBuildProject)
        {
            var json = JsonUtility.ToJson(new Payload()
            {
                text  =$"BuildFinished:\n Target: *{target}* \n OutputPath:{pathToBuildProject} \n FinishedTime:{DateTime.Now} "    
                
            });
            var token = "XXXXX";
            EditorCoroutineUtility.StartCoroutineOwnerless(PostSlackNotification(token,json));
        }

        private const string _baseUrl = "https://hooks.slack.com/services/";

        public static IEnumerator PostSlackNotification(string token, string json)
        {
            using (UnityWebRequest www = SlackRequest(token, json))
            {
                www.SetRequestHeader("Content-Type", "application/json");

                var op = www.Send();

                while (!www.isDone)
                {
                    if (www.isHttpError)
                    {
                        yield break;
                    }

                    yield return null;
                }

                if (www.isNetworkError)
                {
                    Debug.Log(www.error);
                }
            }
        }

        public static UnityWebRequest SlackRequest(string token, string json)
        {
            //POSTだとContent-Typeが変更できない
            UnityWebRequest www = new UnityWebRequest(_baseUrl + token, UnityWebRequest.kHttpVerbPOST);
            www.uploadHandler = new UploadHandlerRaw(Encoding.UTF8.GetBytes(json));
            www.downloadHandler = new DownloadHandlerBuffer();

            www.SetRequestHeader("Content-Type", "application/json");
            return www;
        }
    }
}

SlackNotificationOnBuildFinish.csをEditorフォルダに入れる(なければ作る)
PackageManagerからEditorCoroutineを有効にする.

1. Appsでアプリを作成する
2. Incoming Webhooksを有効にする
3. Add New Webhook to Workspaceでtokenを発行
4. ↑のtokenにトークンを設定
   Build終了後に設定されたチャンネルに通知が投稿される