build.yml in mail-notify-1.0

- old
+ new

@@ -11,12 +11,19 @@
     - uses: actions/checkout@v1
     - name: Set up Ruby 2.6
       uses: actions/setup-ruby@v1
       with:
         ruby-version: 2.6.x
+    - name: Set up cache
+      uses: actions/cache@preview
+      with:
+        path: vendor/bundle
+        key: ${{ runner.os }}-gem-${{ hashFiles('**/mail-notify.gemspec') }}
+        restore-keys: |
+          ${{ runner.os }}-gem-
     - name: Build and test with Rake
       run: |
         sudo apt-get update
         sudo apt-get install sqlite3 libsqlite3-dev
         gem install bundler
-        bundle install --jobs 4 --retry 3
+        bundle install --jobs 4 --retry 3 --path ./vendor/bundle
         bundle exec rake