Refactor docker-compose build logic and pull policy

- Added conditional '--pull' flag on retry in docker-compose build handler, tied to MODE_UPDATE
- Added 'pull_policy: never' to multiple docker-compose service templates to prevent unwanted image pulls
- Fixed minor formatting issues (e.g. Nextcloud volume spacing, WordPress desktop alignment)

Reference: https://chatgpt.com/share/68b0207a-4d9c-800f-b76f-9515885e5183

roles/web-svc-logout/templates/docker-compose.yml.j2

@@ -4,6 +4,7 @@
     build:
       context: {{ docker_repository_path }}
       dockerfile: Dockerfile
+    pull_policy: never
     image: logout
     container_name: logout
     ports: