Fix issues 3,5,6,7,8,9,11,15,16: security hardening and reliability improvements

- ansible.cfg: enable host_key_checking (closes #1)
- update_upgrade.yml: fix reboot crash on non-Debian hosts, exclude AnsibleHost from targets (closes #2, #7)
- deploy.yml: replace silent ignore_errors with real container health assertion (closes #3)
- redeploy.yml: same assertion fix + restic --overwrite always + RESTIC_RESTORE_PATH variable (closes #3, #4, #5)
- disaster.yml: same fixes as redeploy.yml (closes #3, #4, #5)
- docker_update_containers.yml: create missing playbook (closes #6)
- fresh_install.yml: add safety guard to abort if containers already running (closes #8)
- docker_status.yml: add become: true (closes #9)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

playbooks/docker_update_containers.yml

@@ -0,0 +1,37 @@
+---
+- name: Pull latest images and recreate updated containers
+  hosts: Docker
+  tasks:
+    - name: Pull latest images
+      ansible.builtin.command:
+        cmd: docker compose pull
+        chdir: ~/docker
+      register: pull_result
+      changed_when: "'Downloaded newer image' in pull_result.stdout or 'Pulled' in pull_result.stdout"
+
+    - name: Recreate containers with updated images
+      ansible.builtin.command:
+        cmd: docker compose up -d --remove-orphans
+        chdir: ~/docker
+
+    - name: Pause for 30 seconds to allow containers to stabilize
+      ansible.builtin.pause:
+        seconds: 30
+
+    - name: Verify all containers are running
+      ansible.builtin.shell: |
+        expected=$(docker compose config --services | wc -l | tr -d ' ')
+        running=$(docker compose ps --status running -q | wc -l | tr -d ' ')
+        if [ "$expected" != "$running" ]; then
+          echo "FAIL: $running/$expected containers running"
+          docker compose ps
+          exit 1
+        fi
+        echo "OK: all $running containers running"
+      args:
+        chdir: ~/docker
+      changed_when: false
+
+    - name: Remove dangling images
+      ansible.builtin.command:
+        cmd: docker image prune -f