Update the ruby setup in gh-actions

Author: cotes2020

.github/workflows/pages-deploy.yml

@@ -13,32 +13,17 @@ jobs:
 
     runs-on: ubuntu-latest
 
-    env:
-      GEMS_PATH: ~/vendor/bundle
-
     steps:
       - name: Checkout
         uses: actions/checkout@v2
         with:
           fetch-depth: 0  # for posts's lastmod
 
       - name: Setup Ruby
-        uses: actions/setup-ruby@v1
+        uses: ruby/setup-ruby@v1
         with:
           ruby-version: 2.7
-
-      - name: Bundle Caching
-        uses: actions/cache@v2
-        with:
-          path: ${{ env.GEMS_PATH }}
-          key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-gems-
-
-      - name: Bundle Install
-        run: |
-          bundle config path ${{ env.GEMS_PATH }}
-          bundle install --jobs 4 --retry 3
+          bundler-cache: true
 
       - name: Check baseurl
         run: |

.gitignore

@@ -2,9 +2,10 @@
 .*
 !.github
 
-# jekyll cache
+# bundler cache
 _site
 vendor
+Gemfile.lock
 
 # rubygem
 *.gem

README.md

@@ -60,7 +60,7 @@ $tab-count: {{ site.tabs | size | plus: 1 }};
 
 ### Publishing to GitHub Pages
 
-See the `jekyll-theme-chirpy`'s [deployment instructions](https://github.com/cotes2020/jekyll-theme-chirpy#deployment). Note that in order to use GitHub Actions caching to speed up the deployment, you should add the `Gemfile.lock` file to your repository.
+See the [deployment instructions](https://github.com/cotes2020/jekyll-theme-chirpy#deployment) of `jekyll-theme-chirpy`.
 
 ### Updating