Add Docker setup for production environment.

docker/nginx/Dockerfile

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+FROM nginx:alpine3.18-slim
+
+COPY nginx.conf /etc/nginx/conf.d/default.conf

docker/nginx/nginx.conf

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+server {
+    listen 80 default_server;
+    listen [::]:80 default_server;
+    server_name captcha;
+
+    client_max_body_size 1024M;
+
+    root /var/www/html/public;
+
+    location / {
+        location /api-docs {
+            proxy_pass http://swagger:8080;
+            proxy_set_header Host $http_host;
+            proxy_set_header X-Forwarded-Host $http_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_redirect off;
+            proxy_http_version 1.1;
+            proxy_set_header Upgrade $http_upgrade;
+        }
+        location / {
+            proxy_pass http://app:9000;
+            proxy_set_header Host $http_host;
+            proxy_set_header X-Forwarded-Host $http_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_redirect off;
+            proxy_http_version 1.1;
+            proxy_set_header Upgrade $http_upgrade;
+        }
+    }
+}