docker-compose pre prod (non final)

frontend/.dockerignore

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+node_modules
+dist
+.git

frontend/Dockerfile

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+# ---- builder: npm ci + vite build -----------------------------------------
+FROM node:22-alpine AS builder
+
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+
+COPY . .
+RUN npm run build
+
+# ---- runtime: static files served by nginx ---------------------------------
+FROM nginx:1.27-alpine AS runtime
+
+COPY --from=builder /app/dist /usr/share/nginx/html
+# Rendered to /etc/nginx/conf.d/default.conf at container start by the base
+# image's docker-entrypoint.sh, substituting ${BACKEND_UPSTREAM} (set via
+# compose env, e.g. "backend:5000").
+COPY nginx.conf.template /etc/nginx/templates/default.conf.template
+
+EXPOSE 80