Prep build setup for stack

rust-engine/Dockerfile

@@ -1,12 +1,30 @@
 # rust-engine/Dockerfile
 # --- Stage 1: Builder ---
-FROM rust:1.7-slim as builder
+FROM rust:1.82-slim AS builder
 WORKDIR /usr/src/app
-COPY . .
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y \
+    pkg-config \
+    libssl-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy Cargo files for dependency caching
+COPY Cargo.toml Cargo.lock ./
+# Create a dummy src/main.rs for dependency build
+RUN mkdir src && echo "fn main() {}" > src/main.rs
+RUN cargo build --release && rm src/main.rs
+
+# Copy source code and build
+COPY src ./src
 RUN cargo build --release
 
 # --- Stage 2: Final Image ---
-FROM debian:buster-slim
+FROM debian:bookworm-slim
+RUN apt-get update && apt-get install -y \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
 COPY --from=builder /usr/src/app/target/release/rust-engine /usr/local/bin/rust-engine
 EXPOSE 8000
 CMD ["rust-engine"]