feat: write journald config to separate file

tasks/configure_persistent_journald_logging.yml

@@ -15,7 +15,7 @@
   # Documentation: https://www.freedesktop.org/software/systemd/man/journald.conf.html
   - name: configure journald
     blockinfile:
-      path: "/etc/systemd/journald.conf"
+      path: "/etc/systemd/journald.conf.d/persistence.conf"
       owner: "root"
       group: "root"
       mode: "0644"