Add deployable QUIC P2P hole-punch coordination server

Dockerfile

@@ -0,0 +1,15 @@
+FROM rust:1.94-bookworm AS build
+RUN apt-get update && apt-get install -y --no-install-recommends cmake && rm -rf /var/lib/apt/lists/*
+WORKDIR /build
+COPY Cargo.toml Cargo.lock ./
+COPY src ./src
+RUN cargo build --locked --release
+
+FROM debian:bookworm-slim
+RUN groupadd --gid 10001 chatmask && useradd --uid 10001 --gid chatmask --no-create-home chatmask && mkdir /data && chown chatmask:chatmask /data
+COPY --from=build /build/target/release/chatmask-server /usr/local/bin/chatmask-server
+USER chatmask
+EXPOSE 7001/udp
+STOPSIGNAL SIGTERM
+ENTRYPOINT ["chatmask-server"]
+CMD ["--key", "/data/server.key"]