dockerize it

Dockerfile

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+# Use Debian-based image with better build support
+FROM node:16-bullseye AS builder
+
+# Install system dependencies for node-canvas
+RUN apt-get update && apt-get install -y \
+  python3 \
+  make \
+  g++ \
+  libcairo2-dev \
+  libpango1.0-dev \
+  libjpeg-dev \
+  libgif-dev \
+  librsvg2-dev \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/*
+
+# Pin known working npm version
+RUN npm install -g npm@8.19.4
+
+WORKDIR /app
+COPY package.json package-lock.json ./
+
+# Use legacy peer deps to avoid vite conflict
+RUN npm install --legacy-peer-deps
+
+COPY . .
+
+# Optional: skip gen if it fails
+RUN npm run gen || true
+RUN npm run build
+
+# ---- Runtime image ----
+FROM nginx:stable-alpine
+
+LABEL org.opencontainers.image.source="https://github.com/sharechess/sharechess"
+
+COPY --from=builder /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/sharechess.conf
+RUN rm /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=5s \
+  CMD curl -f http://localhost/ || exit 1
+
+CMD ["nginx", "-g", "daemon off;"]