Add Docker CI/CD

Dockerfile

@@ -1,20 +1,24 @@
-# Stage 1: Build application
-FROM node:22-bookworm-slim AS builder
-
+# Stage 1: Install dependencies (including build tools)
+FROM node:22-bookworm-slim AS deps
 WORKDIR /app
 COPY package*.json ./
-RUN npm ci --omit=dev
+RUN npm ci
+
+# Stage 2: Build application
+FROM node:22-bookworm-slim AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
 COPY . .
 RUN npm run build
 
-# Stage 2: Prepare static web server
+# Stage 3: 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
+# Stage 4: Create runtime image
 FROM gcr.io/distroless/static-debian12:nonroot
 
 COPY --from=builder --chown=nonroot:nonroot /app/dist /app