Improved CI performance [skip ci]

Author: ankane

.github/workflows/build.yml

@@ -75,6 +75,7 @@ jobs:
 
       - run: |
           sudo apt-get update
+          sudo rm /var/lib/man-db/auto-update # skip man-db triggers for performance
           sudo apt-get install redis-server
           sudo systemctl start redis-server
       - run: bundle exec rake test