fix: install systemd-resolved package on Debian 12 to make name resolution work on fresh installs

tasks/configure_network.yml

@@ -14,7 +14,10 @@
 # is configured as expected.
 #
 # We seize the opportunity to switch over to `systemd-resolvd` as well, because
-# it offers DNSSec etc., and, frankly, because we can.
+# it offers DNSSec etc., and, frankly, because we can. Beginning with Debian
+# 12 'Bookworm', systemd-resolved is a separate package that needs to be
+# installed on the system, and is no longer included in the more generic
+# systemd package.
 #
 # After these tasks have run, you can use `resolvectl` to check if the name
 # resolution is configured as expected.
@@ -31,6 +34,12 @@
 # `systemd-networkd`. Now, '/etc/network/interfaces' will only contain the
 # config for the loopback interface.
 
+- name: install systemd-resolved
+  ansible.builtin.apt:
+    name: "systemd-resolved"
+    state: latest
+  when: ansible_distribution == 'Debian' and ansible_distribution_major_version == '12'
+
 - name: deploy network interface config
   ansible.builtin.template:
     src: "{{ item }}.j2"