feat: allow always show post updated banner

_config.yml

@@ -608,6 +608,10 @@ post:
   # Update date is displayed at the beginning of the post. The default date is the update date of the md file, which can be manually specified by `updated` in front-matter (same format as date)
   updated:
     enable: false
+
+    # 是否永久显示更新时间横幅，如为false则仅修改文章后才显示
+    # Whether to permanently display the update-time banner. If set to false then it will only be displayed after modifying the article
+    always_show: false
 
     # 格式参照 ISO-8601 日期格式化
     # ISO-8601 date format

layout/post.ejs

@@ -15,7 +15,7 @@ page.banner_mask_alpha = page.banner_mask_alpha || theme.post.banner_mask_alpha
         <div id="board">
           <article class="post-content mx-auto">
             <h1 id="seo-header"><%= page.subtitle || page.title %></h1>
-            <% if (theme.post.updated.enable && theme.post.updated && compare_date(page.date, page.updated)) { %>
+            <% if (theme.post.updated.enable && theme.post.updated && (theme.post.updated.always_show || compare_date(page.date, page.updated))) { %>
               <p id="updated-time" class="note note-<%= theme.post.updated.note_class || 'info' %>" style="<%= theme.post.updated.relative ? 'display: none' : '' %>">
                 <% if (theme.post.updated.relative) { %>
                   <% if (theme.post.updated.content) { %>