feat: add Nginx reverse proxy and SSL configuration

- Introduce Nginx service in docker-compose for handling HTTP/HTTPS traffic.
- Configure Nginx with SSL support and health checks for Grafana and Prometheus.
- Update env.template to include SERVER_IP and STATUS_PAGE_PASSWORD variables.
- Enhance Ansible playbook with tasks for Nginx installation, SSL certificate generation, and configuration management.

infra/nginx/conf.d/prometheus.conf

@@ -0,0 +1,34 @@
+# Prometheus reverse proxy configuration
+upstream prometheus_backend {
+    server prometheus:9090;
+    keepalive 32;
+}
+
+# Prometheus proxy configuration
+location /prometheus/ {
+    proxy_pass http://prometheus_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;
+    proxy_set_header X-Forwarded-Host $host;
+    proxy_set_header X-Forwarded-Port $server_port;
+
+    # 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;
+    proxy_busy_buffers_size 8k;
+}
+
+# Health check endpoint
+location /prometheus/-/healthy {
+    proxy_pass http://prometheus_backend/-/healthy;
+    proxy_set_header Host $host;
+    access_log off;
+}