✨ feat(infrastructure): introduce ansible deployment for taler services

- add ansible playbooks and roles for deploying taler exchange and merchant
- configure PostgreSQL, GNU Taler repositories, and services

🔧 chore(config): provide example env and gitignore for sensitive files

- create .env-example with placeholders for sensitive info
- add .gitignore entries for .env and common editor files

ansible.cfg

@@ -0,0 +1,12 @@
+[defaults]
+inventory = inventories/local/hosts.yml
+roles_path = roles
+collections_paths = ./collections
+pipelining = True
+retry_files_enabled = False
+interpreter_python = auto
+
+[ssh_connection]
+ssh_args = -o ControlMaster=auto -o ControlPersist=60s
+control_path = ~/.ansible/cp/%%h-%%p-%%r
+