fix: use shell command for docker pull to get better error messages

- Replace docker_image module with shell command for more reliable pulling
- Add detailed error output from pull command (stdout/stderr)
- Show actual docker pull error messages when pull fails
- Simplify pull logic - always attempt pull regardless of local existence

deployment/ansible/playbooks/deploy-image.yml

@@ -144,36 +144,30 @@
       changed_when: false
       failed_when: false
 
-    - name: Pull Docker image (force pull if not exists locally)
-      community.docker.docker_image:
-        name: "{{ deploy_image }}"
-        source: pull
-        pull: always
-      when: 
-        - registry_accessible is defined and registry_accessible == 'true'
-        - image_exists_before_pull.stdout | default('') == 'NOT_FOUND'
-      register: image_pull_result
-      ignore_errors: yes
-      failed_when: false
+    - name: Display image existence check
+      ansible.builtin.debug:
+        msg:
+          - "Image exists before pull: {{ image_exists_before_pull.stdout | default('unknown') }}"
+          - "Will pull: {{ 'YES' if (image_exists_before_pull.stdout | default('') == 'NOT_FOUND') else 'NO (already exists)' }}"
+      when: registry_accessible is defined and registry_accessible == 'true'
 
-    - name: Pull Docker image (if already exists, just verify)
-      community.docker.docker_image:
-        name: "{{ deploy_image }}"
-        source: pull
-        pull: true
+    - name: Pull Docker image from registry using shell command
+      ansible.builtin.shell: |
+        docker pull {{ deploy_image }} 2>&1
       when: 
         - registry_accessible is defined and registry_accessible == 'true'
-        - image_exists_before_pull.stdout | default('') != 'NOT_FOUND'
       register: image_pull_result
       ignore_errors: yes
       failed_when: false
+      changed_when: image_pull_result.rc == 0
 
     - name: Display pull result
       ansible.builtin.debug:
         msg:
-          - "Pull result: {{ image_pull_result | default('not executed') }}"
-          - "Pull failed: {{ image_pull_result.failed | default(false) }}"
-          - "Pull changed: {{ image_pull_result.changed | default(false) }}"
+          - "Pull command exit code: {{ image_pull_result.rc | default('unknown') }}"
+          - "Pull stdout: {{ image_pull_result.stdout | default('none') }}"
+          - "Pull stderr: {{ image_pull_result.stderr | default('none') }}"
+          - "Pull succeeded: {{ 'YES' if (image_pull_result.rc | default(1) == 0) else 'NO' }}"
       when: registry_accessible is defined and registry_accessible == 'true'
 
     - name: Verify image exists locally after pull
@@ -205,11 +199,19 @@
         msg: |
           Failed to pull image {{ deploy_image }} from registry.
           The image does not exist locally after pull attempt.
-          Pull result: changed={{ image_pull_result.changed | default(false) }}, failed={{ image_pull_result.failed | default(false) }}
+          
+          Pull command result:
+          - Exit code: {{ image_pull_result.rc | default('unknown') }}
+          - Stdout: {{ image_pull_result.stdout | default('none') }}
+          - Stderr: {{ image_pull_result.stderr | default('none') }}
+          
+          Image check result: {{ image_check.stdout | default('unknown') }}
+          
           Please check:
           1. Does the image exist in {{ source_registry }}?
           2. Are registry credentials correct?
           3. Is the registry accessible?
+          4. Check the pull command output above for specific error messages.
       when: 
         - registry_accessible is defined and registry_accessible == 'true'
         - (image_check.stdout | default('') == 'NOT_FOUND' or image_check.stdout | default('') == '')