chore(common): install libnss-resolve for better integration with r…

…esolved

This makes applications that use the glibc getaddrbyname and similar
APIs that fall back to glibc NSS talk directly to systemd-resolved
through Unix sockets instead of falling back to its stub DNS resolver
over UDP on the loopback interface, which is more efficient and
reliable, as no firewall rules can block such communication.

roles/common/tasks/main.yml

@@ -23,6 +23,9 @@
       # Necessary for Ansible:
       # https://docs.ansible.com/ansible-core/2.14/playbook_guide/playbooks_privilege_escalation.html#risks-of-becoming-an-unprivileged-user
       - acl
+      # Letting glibc NSS use systemd-resolved for DNS resolution is more robust and efficient,
+      # as otherwise a fallback to UDP DNS packets over the loopback interface is done
+      - libnss-resolve
     install_recommends: false
     update_cache: true