chore: add Docker multi-stage build and Docker Compose stack

openai-proxy/Dockerfile

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+# Build stage
+FROM rust:1.82-slim AS builder
+
+RUN apt-get update && apt-get install -y \
+    pkg-config \
+    libssl-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY Cargo.toml Cargo.lock ./
+RUN mkdir src && echo 'fn main(){}' > src/main.rs
+RUN cargo build --release
+RUN rm src/main.rs
+
+COPY src ./src
+RUN touch src/main.rs && cargo build --release
+
+# Runtime stage
+FROM debian:bookworm-slim AS runtime
+
+RUN apt-get update && apt-get install -y \
+    ca-certificates \
+    libssl3 \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY --from=builder /app/target/release/openai-proxy /usr/local/bin/openai-proxy
+
+EXPOSE 8080
+
+ENTRYPOINT ["openai-proxy"]

openai-proxy/docker-compose.yml

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+version: "3.9"
+
+services:
+  postgres:
+    image: postgres:16-alpine
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: proxy
+      POSTGRES_PASSWORD: proxy
+      POSTGRES_DB: proxydb
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+      - ./init.sql:/docker-entrypoint-initdb.d/init.sql
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U proxy -d proxydb"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  proxy:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    restart: unless-stopped
+    depends_on:
+      postgres:
+        condition: service_healthy
+    environment:
+      DATABASE_URL: postgres://proxy:proxy@postgres:5432/proxydb
+      UPSTREAM_URL: ${UPSTREAM_URL:-https://api.openai.com}
+      UPSTREAM_API_KEY: ${UPSTREAM_API_KEY}
+      BIND_ADDR: 0.0.0.0
+      PORT: 8080
+      RUST_LOG: ${RUST_LOG:-info}
+    ports:
+      - "${PORT:-8080}:8080"
+
+volumes:
+  postgres_data: