Merge pull request #14 from google/gh-action-cache

Cache the artifacts built by the publish workflow

.github/workflows/publish.yml

@@ -30,18 +30,26 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
+
+      - uses: Swatinem/rust-cache@v2
+
       - name: Install mdbook
         run: cargo install mdbook
+
       - name: Install mdbook-svgbob
         run: cargo install mdbook-svgbob
+
       - name: Build book
         run: mdbook build
+
       - name: Setup Pages
         uses: actions/configure-pages@v2
+
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v1
         with:
           path: 'book'
+
       - name: Deploy to GitHub Pages
         id: deployment
         uses: actions/deploy-pages@v1