✨ 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_exchange/handlers/main.yml

@@ -0,0 +1,26 @@
+---
+- name: Restart taler-exchange-httpd
+  ansible.builtin.service:
+    name: taler-exchange-httpd
+    state: restarted
+
+- name: Restart taler-exchange-aggregator
+  ansible.builtin.service:
+    name: taler-exchange-aggregator
+    state: restarted
+
+- name: Restart taler-exchange-closer
+  ansible.builtin.service:
+    name: taler-exchange-closer
+    state: restarted
+
+- name: Restart taler-exchange-transfer
+  ansible.builtin.service:
+    name: taler-exchange-transfer
+    state: restarted
+
+- name: Restart taler-exchange-wirewatch
+  ansible.builtin.service:
+    name: taler-exchange-wirewatch
+    state: restarted
+