Add Docker CI/CD

Dockerfile

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+# Stage 1: Build application
+FROM node:22-bookworm-slim AS builder
+
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci --omit=dev
+COPY . .
+RUN npm run build
+
+# Stage 2: Prepare static web server
+FROM alpine:3.19 AS server-prep
+RUN wget -O /tmp/sws.tar.gz \
+    https://github.com/static-web-server/static-web-server/releases/download/v2.17.0/static-web-server-v2.17.0-x86_64-unknown-linux-musl.tar.gz
+RUN tar -xzf /tmp/sws.tar.gz -C /tmp \
+    --strip-components=1
+
+# Stage 3: Create runtime image
+FROM gcr.io/distroless/static-debian12:nonroot
+
+COPY --from=builder --chown=nonroot:nonroot /app/dist /app
+
+COPY --from=server-prep --chown=nonroot:nonroot /tmp/static-web-server /usr/local/bin/
+
+USER nonroot
+WORKDIR /app
+EXPOSE 8080
+
+ENTRYPOINT ["/usr/local/bin/static-web-server"]
+CMD ["--port", "8080", "--root", "/app", "--log-level", "warn"]