feat: integrate Uptime Kuma and Alertmanager into Docker setup

- Add Uptime Kuma service for status monitoring with health checks.
- Introduce Alertmanager service for alert management and notifications.
- Update docker-compose.yml to include new services and their configurations.
- Enhance Makefile with commands for managing Uptime Kuma and Alertmanager logs.
- Modify Ansible playbook to install necessary packages and configure SSL for new services.
- Update Nginx configuration to route traffic to Uptime Kuma and Alertmanager.
- Adjust Prometheus configuration to include alert rules and external URLs.

infra/nginx/conf.d/prometheus.conf

@@ -1,12 +1,7 @@
-# Prometheus reverse proxy configuration
-upstream prometheus_backend {
-    server prometheus:9090;
-    keepalive 32;
-}
-
 # Prometheus proxy configuration
 location /prometheus/ {
     proxy_pass http://prometheus_backend/;
+    proxy_redirect / /prometheus/;
     proxy_set_header Host $host;
     proxy_set_header X-Real-IP $remote_addr;
     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
@@ -31,4 +26,4 @@ location /prometheus/-/healthy {
     proxy_pass http://prometheus_backend/-/healthy;
     proxy_set_header Host $host;
     access_log off;
-}
+}