Disable service worker by default (#18914)

The service worker causes a lot of issues with JS errors after instance
upgrades while not bringing any real performance gain over regular HTTP
caching.

Disable it by default for this reason. Maybe later we can remove it
completely, as I simply see no benefit in having it.

custom/conf/app.example.ini

@@ -1115,7 +1115,7 @@ PATH =
 ;SEARCH_REPO_DESCRIPTION = true
 ;;
 ;; Whether to enable a Service Worker to cache frontend assets
-;USE_SERVICE_WORKER = true
+;USE_SERVICE_WORKER = false
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -189,7 +189,7 @@ The following configuration set `Content-Type: application/vnd.android.package-a
     add it to this config.
 - `DEFAULT_SHOW_FULL_NAME`: **false**: Whether the full name of the users should be shown where possible. If the full name isn't set, the username will be used.
 - `SEARCH_REPO_DESCRIPTION`: **true**: Whether to search within description at repository search on explore page.
-- `USE_SERVICE_WORKER`: **true**: Whether to enable a Service Worker to cache frontend assets.
+- `USE_SERVICE_WORKER`: **false**: Whether to enable a Service Worker to cache frontend assets.
 
 ### UI - Admin (`ui.admin`)
 

docs/content/doc/developers/hacking-on-gitea.en-us.md

@@ -185,8 +185,6 @@ Before committing, make sure the linters pass:
 make lint-frontend
 ```
 
-Note: When working on frontend code, set `USE_SERVICE_WORKER` to `false` in `app.ini` to prevent undesirable caching of frontend assets.
-
 ### Configuring local ElasticSearch instance
 
 Start local ElasticSearch instance using docker:

modules/setting/setting.go

@@ -1042,7 +1042,7 @@ func loadFromConf(allowEmpty bool, extraConfig string) {
 	UI.ShowUserEmail = Cfg.Section("ui").Key("SHOW_USER_EMAIL").MustBool(true)
 	UI.DefaultShowFullName = Cfg.Section("ui").Key("DEFAULT_SHOW_FULL_NAME").MustBool(false)
 	UI.SearchRepoDescription = Cfg.Section("ui").Key("SEARCH_REPO_DESCRIPTION").MustBool(true)
-	UI.UseServiceWorker = Cfg.Section("ui").Key("USE_SERVICE_WORKER").MustBool(true)
+	UI.UseServiceWorker = Cfg.Section("ui").Key("USE_SERVICE_WORKER").MustBool(false)
 
 	HasRobotsTxt, err = util.IsFile(path.Join(CustomPath, "robots.txt"))
 	if err != nil {