Add Dockerfile and CI

.github/workflows/build.yml

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+name: build-and-push
+on:
+  push:
+    branches: [ "main" ]
+permissions:
+  contents: read
+  packages: write
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: docker/metadata-action@v5
+        id: meta
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=raw,value=main
+            type=sha,format=short
+      - uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+# syntax=docker/dockerfile:1
+FROM node:20-alpine AS build
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN npm run build
+
+FROM nginx:1.27-alpine
+COPY --from=build /app/dist /usr/share/nginx/html
+# Serve SPA on port 3000 with history fallback
+RUN printf 'server { \
+  listen 3000; \
+  server_name _; \
+  root /usr/share/nginx/html; \
+  index index.html; \
+  location / { try_files $uri /index.html; } \
+}\n' > /etc/nginx/conf.d/default.conf
+EXPOSE 3000
+CMD ["nginx","-g","daemon off;"]