Docker support

Dockerfile

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+# Multi-stage build for C++ finger service
+# Build stage - use Ubuntu with all development dependencies
+FROM ubuntu:24.04 AS builder
+
+# Avoid interactive prompts during package installation
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    meson \
+    ninja-build \
+    pkg-config \
+    libboost-all-dev \
+    libgtest-dev \
+    libgmock-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set working directory
+WORKDIR /app
+
+# Copy source files
+COPY . .
+
+# Build the project
+RUN meson setup builddir --buildtype=release
+RUN meson compile -C builddir
+
+# Run tests to ensure quality
+RUN meson test -C builddir
+
+# Runtime stage - minimal Alpine Linux
+FROM alpine:latest
+
+# Install runtime dependencies (if any)
+RUN apk add --no-cache \
+    libstdc++ \
+    && addgroup -g 1000 finger \
+    && adduser -D -s /bin/sh -u 1000 -G finger finger
+
+# Copy the compiled binary from builder stage
+COPY --from=builder /app/builddir/finger /usr/local/bin/finger
+
+# Make the binary executable
+RUN chmod +x /usr/local/bin/finger
+
+# Create the directory for user data with proper permissions
+RUN mkdir -p /var/finger/users && \
+    chown -R finger:finger /var/finger
+
+# Switch to non-root user
+USER finger
+
+# Expose port 79 (finger protocol)
+EXPOSE 79
+
+# Add health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD nc -z localhost 79 || exit 1
+
+# Set metadata labels
+LABEL org.opencontainers.image.title="finger"
+LABEL org.opencontainers.image.description="A silly finger service written in C++20"
+LABEL org.opencontainers.image.source="https://github.com/waffle2k/finger"
+LABEL org.opencontainers.image.licenses="MIT"
+
+# Set the binary as the default command
+CMD ["finger"]