fix: Use immutable operations for Docker daemon config merge

- Replace append() with list concatenation (+ operator)
- Use combine filter instead of update() method
- Avoids 'unsafe append' error with AnsibleLazyTemplateList
- All operations are now immutable and safe

deployment/ansible/playbooks/deploy-image.yml

@@ -192,16 +192,19 @@
       set_fact:
         docker_daemon_config_dict: "{{ docker_daemon_config.content | b64decode | from_json if (docker_daemon_json.stat.exists and docker_daemon_config.content is defined) else {} }}"
 
+    - name: Build insecure registries list
+      set_fact:
+        insecure_registries_list: >-
+          {%- set existing = docker_daemon_config_dict.get('insecure-registries', []) | list -%}
+          {%- if 'git.michaelschiemer.de:5000' not in existing -%}
+            {{ existing + ['git.michaelschiemer.de:5000'] }}
+          {%- else -%}
+            {{ existing }}
+          {%- endif -%}
+
     - name: Merge insecure registry into Docker daemon config
       set_fact:
-        docker_daemon_config_merged: >-
-          {%- set config = docker_daemon_config_dict.copy() -%}
-          {%- set existing_registries = config.get('insecure-registries', []) | list -%}
-          {%- if 'git.michaelschiemer.de:5000' not in existing_registries -%}
-            {%- set _ = existing_registries.append('git.michaelschiemer.de:5000') -%}
-          {%- endif -%}
-          {%- set _ = config.update({'insecure-registries': existing_registries}) -%}
-          {{ config }}
+        docker_daemon_config_merged: "{{ docker_daemon_config_dict | combine({'insecure-registries': insecure_registries_list}) }}"
 
     - name: Update Docker daemon.json with insecure registry
       copy: