ci: Replace the existing deployment action (#14)

with manually building the site and moving the output to `gh-pages` branch

.github/workflows/build.yml

@@ -16,6 +16,23 @@ jobs:
           key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile') }}
           restore-keys: |
             ${{ runner.os }}-gems-
-      - uses: helaili/[email protected]
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@8575951200e472d5f2d95c625da0c7bec8217c42 # v1.161.0
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
+          ruby-version: '3.1' # Not needed with a .ruby-version file
+          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+          cache-version: 0 # Increment this number if you need to re-download cached gems
+      - name: Build with Jekyll
+        # Outputs to the './_site' directory by default
+        run: bundle exec jekyll build
+        env:
+          JEKYLL_ENV: production
+
+          # Deployment job
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v4
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: ./_site # Location from which to grab the files to deploy
+          publish_branch: gh-pages  # Branch name to deploy to
+          force_orphan: true # Always reset branch to deploy to