chore(docker): add dev Dockerfile for multi-stage Rust build

Dockerfile.dev

@@ -0,0 +1,20 @@
+FROM rust:1.79-slim AS builder
+
+RUN apt-get update && apt-get install -y \
+    pkg-config libssl-dev libclang-dev clang \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+COPY . .
+
+RUN cargo build --bin nu-node
+
+FROM debian:bookworm-slim
+RUN apt-get update && apt-get install -y ca-certificates curl && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+COPY --from=builder /app/target/debug/nu-node /usr/local/bin/nu-node
+
+EXPOSE 9545 9546 30333
+
+CMD ["nu-node"]