feat: add Docker setup with Dockerfile and docker-compose

Co-authored-by: aider (openai/gpt-5) <aider@aider.chat>

.dockerignore

@@ -0,0 +1,22 @@
+# Rust build artifacts
+/target
+
+# VCS
+/.git
+/.gitignore
+
+# Editors/OS
+.DS_Store
+*.swp
+*.swo
+*~
+
+# Node/web (if present)
+node_modules
+dist
+build
+
+# Firmware intermediate dirs (if any)
+firmware/.pio
+firmware/.pioenvs
+firmware/build

Dockerfile

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+# Multi-stage build for Rust Linux container
+FROM rust:1.82-bookworm AS builder
+
+# Build dependencies (libudev for serialport on Linux)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    pkg-config \
+    libudev-dev \
+    build-essential \
+    ca-certificates \
+    tzdata \
+ && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Leverage docker layer caching for dependencies
+COPY Cargo.toml Cargo.lock ./
+RUN mkdir -p src && echo 'fn main() { println!("cargo:rerun-if-changed=build.rs"); }' > src/main.rs
+RUN cargo build --release || true
+RUN rm -rf src
+
+# Copy full source and build real binaries
+COPY . .
+RUN cargo build --release --bin ntp_timeturner --bin ptp_probe
+
+# Runtime image
+FROM debian:bookworm-slim AS runtime
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libudev1 \
+    ca-certificates \
+    tzdata \
+ && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY --from=builder /app/target/release/ntp_timeturner /usr/local/bin/ntp_timeturner
+COPY --from=builder /app/target/release/ptp_probe /usr/local/bin/ptp_probe
+COPY static ./static
+
+ENV RUST_LOG=info
+EXPOSE 8080
+
+# Default to running the main server
+CMD ["ntp_timeturner"]

docker-compose.yml

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+version: "3.8"
+
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: ntp_timeturner:latest
+    container_name: ntp_timeturner
+    environment:
+      - RUST_LOG=info
+    ports:
+      - "8080:8080"
+    volumes:
+      - ./static:/app/static:ro
+    restart: unless-stopped
+
+  # Optional: probe a PTP hardware clock (Linux host with /dev/ptp0)
+  ptp-probe:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    image: ntp_timeturner:latest
+    profiles:
+      - hw
+    command: ["ptp_probe", "--device", "/dev/ptp0", "--interval", "1.0", "--count", "0"]
+    devices:
+      - "/dev/ptp0:/dev/ptp0"
+    restart: "no"