✨ 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

roles/taler_repo/handlers/main.yml

@@ -0,0 +1,4 @@
+---
+- name: Update apt cache for Taler repo
+  ansible.builtin.apt:
+    update_cache: true