Add force: true to ringtail git task

nixos-rebuild can dirty the tree (e.g. flake.lock updates), which
blocks the Ansible git module. Force ensures we always reset to the
upstream state.

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

ansible/playbooks/ringtail.yml

@@ -9,6 +9,7 @@
         repo: "https://forge.ops.eblu.me/eblume/blumeops.git"
         dest: /etc/blumeops
         version: main
+        force: true
       register: _repo
 
     - name: Rebuild NixOS