feat(docker): add Docker configuration for frontend app

frontend/.docker/Dockerfile

@@ -0,0 +1,23 @@
+FROM oven/bun:debian AS build
+WORKDIR /app
+
+RUN apt-get update -y && apt-get install nodejs -y
+
+ENV NODE_ENV=production
+
+COPY package.json bun.lock ./
+RUN bun install --frozen-lockfile
+
+COPY . .
+RUN bun run build
+
+FROM nginx:alpine AS production
+
+RUN rm /etc/nginx/conf.d/default.conf
+COPY .docker/casino.conf /etc/nginx/templates/nginx.conf.template
+COPY .docker/entrypoint.sh /docker-entrypoint.d/40-custom-config-env.sh
+
+COPY --from=build /app/dist/casino /usr/share/nginx/html
+
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]

frontend/.docker/casino.conf

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+server {
+    listen 80;
+    root /usr/share/nginx/html/browser;
+    index index.html;
+
+    location / {
+        try_files $uri $uri/ /index.html;
+        add_header Cache-Control "no-cache";
+    }
+
+    location /backend/ {
+        proxy_pass http://${BACKEND_HOST}:${BACKEND_PORT}/;
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection 'upgrade';
+        proxy_set_header Host $host;
+        proxy_cache_bypass $http_upgrade;
+    }
+}

frontend/.docker/entrypoint.sh

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+#!/bin/sh
+# Default values if not provided
+: ${BACKEND_HOST:=localhost}
+: ${BACKEND_PORT:=8080}
+
+envsubst '$BACKEND_HOST $BACKEND_PORT' < /etc/nginx/templates/nginx.conf.template > /etc/nginx/conf.d/default.conf
+exec nginx -g 'daemon off;'