ci: skip manpage generation

This should speed up dependency installs.

.github/workflows/setup/action.yml

@@ -15,6 +15,11 @@ runs:
 
     - name: Set up rethinkdb
       run: |
+        # We don't need manpages in CI, and they take a significant amount
+        # of time to generate
+        echo "set man-db/auto-update false" | sudo debconf-communicate
+        sudo dpkg-reconfigure man-db
+
         wget -qO- https://download.rethinkdb.com/repository/raw/pubkey.gpg | sudo gpg --dearmor -o /usr/share/keyrings/rethinkdb-archive-keyrings.gpg
         echo "deb [signed-by=/usr/share/keyrings/rethinkdb-archive-keyrings.gpg] https://download.rethinkdb.com/repository/ubuntu-$(lsb_release -cs) $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/rethinkdb.list
         sudo apt-get update