install ruby manually

Author: alxndrsn

.github/workflows/github-pages.yml

@@ -27,10 +27,9 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
-      - name: Setup Pages
-        uses: actions/configure-pages@v3
       - uses: ./.github/actions/install-deps
-      - run: sudo gem install bundler
+      - run: apt-get install -y ruby
+      - run: sudo gem install bundler -v 2.1.4
       # TODO use npm run install-jekyll?
       - run: sudo ./bin/install-jekyll.sh
       # TODO use npm run build-site?