chore(ansible): add per-collection ansible.cfg + drop trailing whitespace

ansible/arcodange/factory/ansible.cfg sets collections_path so ansible
commands run from inside the collection directory still find user-installed
collections under ~/.ansible/collections.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ansible/arcodange/factory/ansible.cfg

@@ -0,0 +1,5 @@
+[defaults]
+collections_path = ~/.ansible/collections
+
+[ssh_connection]
+scp_if_ssh = True

ansible/arcodange/factory/playbooks/tools/hashicorp_vault.yml

@@ -8,7 +8,7 @@
     - name: gitea_admin_password
       prompt: Enter gitea admin password
       unsafe: true # password can contain uncommon chars such as '{'
-  
+
   roles:
     - arcodange.factory.gitea_token