feat: Add CI tests

Signed-off-by: Cerallin <cerallin@cerallin.top>

.github/workflows/buildtest.yml

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+# This workflow will do a clean install of node dependencies, build the source code and run tests across different versions of node
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+
+name: Node.js CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [16.x, 18.x, 20.x, 22.x]
+        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+        path: themes/hexo-theme-yuzu
+
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v2
+      with:
+        node-version: ${{ matrix.node-version }}
+
+    - name: Install node modules
+      run: |
+        npm ci
+        npm i hexo-renderer-pug
+    
+    - name: Modify _config.yml
+      run: cat themes/hexo-theme-yuzu/_root_config_example.yml >> _config.yml
+
+    - name: Build assets
+      run: npm run build

_root_config_example.yml

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+since_year: 2020
+
+post_copy:
+  text: 署名-非商业性使用-相同方式共享
+  text_en: CC BY-NC-SA 2.5 CN
+  link: https://creativecommons.org/licenses/by-nc-sa/2.5/cn/
+
+# 自定义侧边栏
+menu:
+  Archives:
+    widget: Archives # 三种：Archives | Posts | Tags
+  Posts1:
+    name: Posts
+    widget: Posts
+  Posts2:
+    name: Posts2
+    widget: Posts
+  Tags:
+    widget: Tags
+
+# 右上角
+header_menu:
+  关于: /about
+
+# 备案
+beian:
+  enable: true
+  icp: 京ICP备xxxxxxxx号
+
+# visit count
+visit_count:
+  type: busuanzi
+
+# hexo-generator-search
+# Please see https://github.com/wzpan/hexo-generator-search/tree/master for detail.
+search:
+  path: meta.json # changeable
+  field: post
+  content: false # currently unsupported
+
+theme: hexo-theme-yuzu