add dockerfile

Dockerfile

@@ -0,0 +1,32 @@
+# ---- Build stage ----
+FROM node:22-alpine AS build
+
+WORKDIR /app
+
+# Safety valve for the 2 GB host: without a cap a runaway build can exhaust the
+# server's RAM and take down neighbouring containers. Measured peak for this app
+# is ~550 MB, so 1 GB leaves headroom while still failing the build rather than
+# the server. Raise this only if the host gets more RAM.
+ENV NODE_OPTIONS=--max-old-space-size=1024
+
+# Install deps from the lockfile first so this layer is reused when only src changes
+COPY package.json package-lock.json ./
+RUN npm ci --no-audit --no-fund
+
+COPY . .
+RUN npm run build
+
+# ---- Runtime stage ----
+FROM nginx:alpine
+
+# Remove Nginx's default "Welcome" page files completely
+RUN rm -rf /usr/share/nginx/html/*
+
+# Only the compiled assets reach the final image — no node_modules, no source
+COPY --from=build /app/dist /usr/share/nginx/html
+
+COPY nginx.conf /etc/nginx/nginx.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]