feat(ci): Try using linuxbrew

.github/workflows/ci.yml

@@ -19,6 +19,10 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
+      - name: Install Homebrew
+        run: eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
+      - name: Search for pngquant
+        run: brew search pngquant
       - name: Install zola
         uses: taiki-e/install-action@zola
       - name: Generate site content