Dockerfile

# Build stage
FROM rust:1.91.1-slim-bookworm AS builder

WORKDIR /app

# Install build dependencies
RUN apt-get update && apt-get install -y \
    pkg-config \
    libssl-dev \
    && rm -rf /var/lib/apt/lists/*

# Copy manifests
COPY Cargo.toml Cargo.lock ./

# Create dummy main for dependency caching
RUN mkdir src && echo "fn main() {}" > src/main.rs

# Build dependencies only (for caching)
RUN cargo build --release && rm -rf src

# Copy actual source code
COPY src ./src

# Touch main.rs to invalidate the build cache for our code only
RUN touch src/main.rs

# Build the actual application
RUN cargo build --release

# Runtime stage
FROM debian:bookworm-slim

WORKDIR /app

# Install runtime dependencies
RUN apt-get update && apt-get install -y \
    ca-certificates \
    libssl3 \
    && rm -rf /var/lib/apt/lists/*

# Copy the binary from builder
COPY --from=builder /app/target/release/iggy_sample /app/iggy_sample

# Create non-root user
RUN useradd -m -u 1000 appuser && chown -R appuser:appuser /app
USER appuser

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

# Run the application
CMD ["./iggy_sample"]