Fix: include missing docker log-opts in config

The default docker config options, which specify the ``log-opts`` under
``roles/docker/vars/main.yml``, were not included in the
``docker_config`` combinations when the docker role was extracted from
the baremetal role in the Zed release. This means that
``docker_log_max_file`` and ``docker_log_max_size`` are not written into
the docker daemon.json.

The var name needs to be changed, as it can't be recursively defined
within the ``docker_config`` definition under
``roles/docker/tasks/config.yml`.

Closes-Bug: #2040105
Change-Id: I05efda2a9699336136dce8cfa99ada77b9b2a17b

releasenotes/notes/fix-include-docker-log-opts-15607fb5a4ad3ed5.yaml

@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    Docker log-opts are now included in the docker daemon.json config again.
+    This allows for ``docker_log_max_file`` and ``docker_log_max_size`` to now
+    be set/overidden correctly.
+    `LP#2044537 <https://launchpad.net/bugs/2040105>`__

roles/docker/tasks/config.yml

@@ -33,7 +33,7 @@
     docker_config_debug:
       debug: "{{ docker_debug }}"
     docker_config: >-
-      {{ {}
+      {{ default_docker_config
          | combine(docker_zun_config if docker_configure_for_zun | bool and 'zun-compute' in group_names else {})
          | combine(docker_config_insecure_registries if docker_registry_insecure | bool else {})
          | combine(docker_config_registry_mirror if docker_registry_mirrors | length > 0 else {})

roles/docker/vars/main.yml

@@ -1,5 +1,5 @@
 ---
-docker_config:
+default_docker_config:
   log-opts:
     max-file: "{{ docker_log_max_file }}"
     max-size: "{{ docker_log_max_size }}"