try gh actions to get modified time

Author: ryanphuang

.github/workflows/deploy.yml

@@ -0,0 +1,38 @@
+name: Build and deploy site
+
+on:
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # for jekyll-last-modified-at to access git history
+
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.1'
+
+      - name: Install dependencies
+        run: |
+          gem install bundler
+          bundle config set --local path 'vendor/bundle'
+          bundle install
+
+      - name: Build site with Jekyll
+        run: bundle exec jekyll build
+
+      - name: Deploy to GitHub pages
+        uses: peaceiris/actions-gh-pages@v3
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./_site
+          publish_branch: gh-pages

_includes/footer.html

@@ -5,7 +5,7 @@
     <p class="footer-text m-0 col-lg-8 col-md-12">
       Copyright &copy; OrderLab 2017-<script>
  document.write(new Date().getFullYear());
-      </script> All rights reserved. | Last updated {{ site.time }}.
+      </script> All rights reserved. | Last updated {{ page.last_modified_at }}.
     </p>
   </div>
 </div>