first commit

Dockerfile

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+# ── Stage 1: build frontend ──────────────────────────────────────────────────
+FROM node:22-alpine AS frontend-builder
+
+WORKDIR /app/frontend
+
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm ci
+
+COPY frontend/ ./
+RUN npm run build          # → /app/frontend/dist
+
+
+# ── Stage 2: build backend ────────────────────────────────────────────────────
+FROM rust:1.82-alpine AS backend-builder
+
+# musl-dev for static linking on Alpine
+RUN apk add --no-cache musl-dev
+
+WORKDIR /app/backend
+
+# Cache dependency layer — copy manifests first, then source
+COPY backend/Cargo.toml backend/Cargo.lock ./
+RUN mkdir src && echo 'fn main(){}' > src/main.rs && cargo build --release && rm -rf src
+
+COPY backend/src ./src
+# Touch main.rs so cargo knows it changed after the dummy build above
+RUN touch src/main.rs && cargo build --release
+
+
+# ── Stage 3: final runtime image ─────────────────────────────────────────────
+FROM alpine:3.20
+
+WORKDIR /app
+
+COPY --from=backend-builder /app/backend/target/release/showdown-backend ./showdown-backend
+COPY --from=frontend-builder /app/frontend/dist ./dist
+
+ENV PORT=8080
+ENV STATIC_DIR=/app/dist
+
+EXPOSE 8080
+
+CMD ["./showdown-backend"]