feat(docs, blog): add support for tags.yml, predefined list of tags (#10137)

Co-authored-by: Sébastien Lorber <slorber@users.noreply.github.com>
Co-authored-by: OzakIOne <OzakIOne@users.noreply.github.com>
Co-authored-by: sebastien <lorber.sebastien@gmail.com>
Co-authored-by: slorber <slorber@users.noreply.github.com>

packages/docusaurus-plugin-content-blog/src/index.ts

@@ -20,6 +20,7 @@ import {
   DEFAULT_PLUGIN_ID,
   resolveMarkdownLinkPathname,
 } from '@docusaurus/utils';
+import {getTagsFilePathsToWatch} from '@docusaurus/utils-validation';
 import {
   getSourceToPermalink,
   getBlogTags,
@@ -104,9 +105,16 @@ export default async function pluginContentBlog(
         (contentPath) => include.map((pattern) => `${contentPath}/${pattern}`),
       );
 
-      return [authorsMapFilePath, ...contentMarkdownGlobs].filter(
-        Boolean,
-      ) as string[];
+      const tagsFilePaths = getTagsFilePathsToWatch({
+        contentPaths,
+        tags: options.tags,
+      });
+
+      return [
+        authorsMapFilePath,
+        ...tagsFilePaths,
+        ...contentMarkdownGlobs,
+      ].filter(Boolean) as string[];
     },
 
     getTranslationFiles() {