fix: prevent Traefik restart loops and improve Docker registry login

Registry Login Fixes:
- Filter out service names (minio, redis) from registry URL extraction
- Only recognize actual registry URLs (with TLD or port)
- Preserve port numbers in registry URLs (e.g. git.michaelschiemer.de:5000)
- Better error messages for failed logins

Traefik Restart Loop Prevention:
- Set traefik_auto_restart default to false in traefik role
- Add traefik_auto_restart, traefik_ssl_restart, gitea_auto_restart to staging vars
- Add guard to fix-gitea-traefik-connection.yml restart task
- Add guard and deprecation warning to update-gitea-traefik-service.yml

This ensures that:
- CI/CD pipelines won't cause Traefik restart loops
- Staging environment uses same safe defaults as production
- Deprecated playbooks fail by default unless explicitly enabled
- Only actual Docker registries are used for login, not service names

deployment/ansible/playbooks/update-gitea-traefik-service.yml

@@ -0,0 +1,79 @@
+---
+# Ansible Playbook: Update Gitea Traefik Service with Current IP
+# 
+# ⚠️ DEPRECATED: This playbook is no longer needed since Traefik runs in bridge network mode.
+# Service discovery via Docker labels works reliably in bridge mode, so manual IP updates
+# are not required. This playbook is kept for reference only.
+#
+# Purpose: Update Traefik dynamic config with current Gitea container IP
+# Usage:
+#   ansible-playbook -i inventory/production.yml playbooks/update-gitea-traefik-service.yml \
+#     --vault-password-file secrets/.vault_pass
+
+- name: Update Gitea Traefik Service with Current IP
+  hosts: production
+  vars:
+    traefik_stack_path: "{{ stacks_base_path }}/traefik"
+    gitea_url: "https://{{ gitea_domain }}"
+
+  tasks:
+    - name: Warn that this playbook is deprecated
+      ansible.builtin.fail:
+        msg: |
+          ⚠️  This playbook is DEPRECATED and should not be used.
+          Traefik service discovery via Docker labels works reliably in bridge mode.
+          If you really need to run this, set traefik_auto_restart=true explicitly.
+      when: traefik_auto_restart | default(false) | bool == false
+
+    - name: Get current Gitea container IP in traefik-public network
+      shell: |
+        docker inspect gitea | grep -A 10 'traefik-public' | grep IPAddress | head -1 | awk '{print $2}' | tr -d '",'
+      register: gitea_ip
+      changed_when: false
+
+    - name: Display Gitea IP
+      debug:
+        msg: "Gitea container IP: {{ gitea_ip.stdout }}"
+
+    - name: Create Gitea service configuration with current IP
+      copy:
+        dest: "{{ traefik_stack_path }}/dynamic/gitea-service.yml"
+        content: |
+          http:
+            services:
+              gitea:
+                loadBalancer:
+                  servers:
+                    - url: http://{{ gitea_ip.stdout }}:3000
+        mode: '0644'
+
+    - name: Restart Traefik to load new configuration
+      shell: |
+        docker compose -f {{ traefik_stack_path }}/docker-compose.yml restart traefik
+      when: traefik_auto_restart | default(false) | bool
+
+    - name: Wait for Traefik to be ready
+      pause:
+        seconds: 10
+
+    - name: Test Gitea via Traefik
+      uri:
+        url: "{{ gitea_url }}/api/healthz"
+        method: GET
+        status_code: [200]
+        validate_certs: false
+        timeout: 10
+      register: final_test
+      retries: 5
+      delay: 2
+      changed_when: false
+
+    - name: Display result
+      debug:
+        msg: |
+          Gitea-Traefik connection:
+          - Gitea IP: {{ gitea_ip.stdout }}
+          - Via Traefik: {{ 'OK' if final_test.status == 200 else 'FAILED' }}
+          
+          Note: This is a temporary fix. The IP will need to be updated if the container restarts.
+