Containerize Phaser client

Dockerfile

@@ -0,0 +1,12 @@
+FROM node:22-alpine AS build
+WORKDIR /app
+COPY package.json ./
+RUN npm install
+COPY index.html ./
+COPY src ./src
+RUN npm run build
+
+FROM nginx:1.27-alpine
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=build /app/dist /usr/share/nginx/html
+EXPOSE 80