Optimize Dockerfile for smaller image size and security

Updates Dockerfile to use slim base images, multi-stage build optimization,
and improved package management for reduced attack surface.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: fao89

Dockerfile

@@ -1,15 +1,23 @@
-FROM rust:latest as build
+FROM rust:1.82-slim AS build
+
+RUN apt-get update && apt-get install -y \
+    pkg-config \
+    libssl-dev \
+    libpq-dev \
+    && rm -rf /var/lib/apt/lists/*
 
 COPY . .
 
 RUN cargo build --release
 
-FROM ubuntu:latest
+FROM debian:12-slim
+
+RUN apt-get update && apt-get install -y \
+    libpq5 \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+COPY --from=build /target/release/groot /groot
 
-ENV DEBIAN_FRONTEND=noninteractive
-RUN apt-get -y update && \
-    apt-get -y upgrade  && \
-    apt -y install ca-certificates libssl-dev libpq-dev
+EXPOSE 3030
 
-COPY --from=build /target/release/groot /usr/local/bin
-CMD ["/usr/local/bin/groot"]
+CMD ["/groot"]