fix(ansible): pin Docker to 26.04 (resolute) version

Re-pin docker-ce/docker-ce-cli to the Ubuntu 26.04 (Resolute Raccoon)
build of the current stable engine: 5:29.5.3-1~ubuntu.26.04~resolute.
containerd.io is left to dependency resolution so it tracks a
compatible version automatically.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V6sRimvheRyuCPYgsL68qa

Author: claude

setup_vps/ansible/install-docker.yml

@@ -1,5 +1,8 @@
 ---
 - name: Install Docker on Ubuntu
+  vars:
+    docker_version: "5:29.5.3-1~ubuntu.26.04~resolute"
+
   hosts: all
   become: yes
   tasks:
@@ -43,8 +46,8 @@
     - name: Install Docker CE
       apt:
         name:
-          - docker-ce
-          - docker-ce-cli
+          - "docker-ce={{ docker_version }}"
+          - "docker-ce-cli={{ docker_version }}"
           - containerd.io
           - docker-buildx-plugin
           - docker-compose-plugin