Dockerfile

# ── Stage 1: Build ──
FROM rust:latest AS builder

RUN apt-get update && apt-get install -y pkg-config libssl-dev && rm -rf /var/lib/apt/lists/*

WORKDIR /app

# Cache dependencies
COPY Cargo.toml Cargo.lock* ./
RUN mkdir src && echo "fn main() {}" > src/main.rs
RUN cargo build --release && rm -rf src

# Build the real app
COPY . .
RUN touch src/main.rs && cargo build --release

# ── Stage 2: Runtime ──
FROM debian:bookworm-slim

RUN apt-get update && apt-get install -y ca-certificates libssl3 && rm -rf /var/lib/apt/lists/*

COPY --from=builder /app/target/release/course-flow-backend /usr/local/bin/app
COPY --from=builder /app/migrations /app/migrations

WORKDIR /app

EXPOSE 3000

CMD ["app"]