✨ 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

playbooks/site.yml

@@ -0,0 +1,28 @@
+---
+- name: Bootstrap shared configuration
+  hosts: all
+  become: true
+  gather_facts: true
+  roles:
+    - env_config
+    - common
+    - taler_repo
+
+- name: Prepare PostgreSQL for Taler services
+  hosts: taler_exchange
+  become: true
+  roles:
+    - postgres
+
+- name: Deploy Taler exchange
+  hosts: taler_exchange
+  become: true
+  roles:
+    - taler_exchange
+
+- name: Deploy Taler merchant backend
+  hosts: taler_merchant
+  become: true
+  roles:
+    - taler_merchant
+