Dockerfile

# ── Stage 1: Build ──────────────────────────────────────────────────────────
FROM node:22-alpine AS builder

WORKDIR /app

# Install pnpm
RUN npm install -g pnpm@9

# Install dependencies (cached layer)
COPY package.json pnpm-lock.yaml ./
RUN pnpm install --frozen-lockfile

# Copy source and build
COPY . .
RUN pnpm build

# ── Stage 2: Serve ───────────────────────────────────────────────────────────
FROM nginx:alpine

# Copy built assets to the sub-path the app expects (/endfield-calc/)
COPY --from=builder /app/dist /usr/share/nginx/html/endfield-calc

# Custom nginx config for SPA routing
COPY nginx.conf /etc/nginx/conf.d/default.conf

EXPOSE 80

CMD ["nginx", "-g", "daemon off;"]