✨ 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

inventories/local/hosts.yml

@@ -0,0 +1,12 @@
+---
+all:
+  children:
+    taler_exchange:
+      hosts:
+        localhost:
+          ansible_connection: local
+    taler_merchant:
+      hosts:
+        localhost:
+          ansible_connection: local
+