fix: Missing bundle install

Author: dploeger

.github/workflows/main.yml

@@ -11,6 +11,8 @@ jobs:
     - uses: actions/checkout@v1
     - name: Setup Ruby environment with ruby-build
       uses: clupprich/ruby-build-action@v1.3.0
+    - name: bundle install
+      run: bundler install
     - name: Import new posts
       run: bundler exec jekyll import rss --source https://dev.to/feed/dodevops
     - name: Simple commit