chore(ci): install yarn with npm

Author: Akash Satheesan

.github/workflows/ci.yaml

@@ -149,6 +149,10 @@ jobs:
           ./ci/steps/nfpm.sh -b ~/.local/bin v2.3.1
           echo "$HOME/.local/bin" >> $GITHUB_PATH
 
+      # NOTE: ubuntu-arm64-latest does not include yarn
+      - name: Install yarn
+        run: sudo npm install -g yarn
+
       - name: Download npm package
         uses: actions/download-artifact@v2
         with: