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/alertmanager.conf

@@ -0,0 +1,61 @@
+# Alertmanager Nginx Configuration
+# Proxies requests to Alertmanager
+
+# Alertmanager location
+location /alertmanager/ {
+    # Rate limiting
+    limit_req zone=api burst=10 nodelay;
+    
+    # Remove trailing slash for proxy
+    rewrite ^/alertmanager/(.*)$ /$1 break;
+    
+    # Proxy to Alertmanager
+    proxy_pass http://alertmanager_backend;
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    
+    # Timeouts
+    proxy_connect_timeout 30s;
+    proxy_send_timeout 30s;
+    proxy_read_timeout 30s;
+    
+    # Buffer settings
+    proxy_buffering on;
+    proxy_buffer_size 4k;
+    proxy_buffers 8 4k;
+    
+    # Security headers
+    add_header X-Frame-Options "SAMEORIGIN" always;
+    add_header X-Content-Type-Options "nosniff" always;
+}
+
+# Alertmanager API
+location /api/v1/ {
+    # Rate limiting
+    limit_req zone=api burst=20 nodelay;
+    
+    # Proxy to Alertmanager
+    proxy_pass http://alertmanager_backend;
+    proxy_set_header Host $host;
+    proxy_set_header X-Real-IP $remote_addr;
+    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    proxy_set_header X-Forwarded-Proto $scheme;
+    
+    # CORS headers
+    add_header Access-Control-Allow-Origin "*" always;
+    add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS" always;
+    add_header Access-Control-Allow-Headers "DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization" always;
+    
+    # Handle preflight requests
+    if ($request_method = 'OPTIONS') {
+        add_header Access-Control-Allow-Origin "*";
+        add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS";
+        add_header Access-Control-Allow-Headers "DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization";
+        add_header Access-Control-Max-Age 1728000;
+        add_header Content-Type "text/plain; charset=utf-8";
+        add_header Content-Length 0;
+        return 204;
+    }
+}