Add container build

contrib/container/Dockerfile

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+FROM debian:stable-slim AS builder
+
+ENV BUILD_PKGS \
+    build-essential \
+    autoconf \
+    libevent-dev \
+    libssl-dev \
+    protobuf-compiler \
+    protobuf-c-compiler \
+    libprotobuf-c-dev \
+    libfstrm-dev \
+    bison \
+    flex \
+    curl \
+    jq \
+    git
+
+# Install dependencies
+RUN apt-get update && \
+    apt-get install -yqq ${BUILD_PKGS}
+
+# Fetch source
+WORKDIR /nsd-src
+COPY . /nsd-src
+RUN git submodule update --init
+
+# Build the project
+RUN autoreconf --install && \
+    ./configure --with-configdir=/config --localstatedir=/storage --enable-root-server && \
+    make && \
+    make DESTDIR=/tmp/nsd-install install
+
+# Save result
+RUN tar cvzfC /nsd.tar.gz /tmp/nsd-install usr/local config storage
+
+
+FROM debian:stable-slim
+
+# Environment
+ENV RUNTIME_PKGS \
+    procps \
+    openssl \
+    libssl3 \
+    libevent-2.1 \
+    libprotobuf-c1 \
+    libfstrm-dev
+
+# Copy artifacts
+COPY --from=builder /nsd.tar.gz /tmp
+RUN tar xvzpf /tmp/nsd.tar.gz
+RUN rm -f /tmp/nsd.tar.gz
+
+# Install dependencies and create nsd user and group
+ARG UID=53
+RUN apt-get update && \
+    apt-get install -yqq ${RUNTIME_PKGS} && \
+    rm -rf /var/lib/apt/lists/* && \
+    ldconfig && \
+    useradd --system --user-group -M --home /storage --uid ${UID} nsd && \
+    install -d -o nsd -g nsd /config /storage && \
+    chown -R nsd:nsd /config /storage
+
+# Add default config
+ADD container/nsd.conf /config
+
+# Add entrypoint
+ADD container/entrypoint.sh /
+ENTRYPOINT ["bash", "/entrypoint.sh"]
+
+# Expose port
+EXPOSE 53/udp
+EXPOSE 53/tcp
+EXPOSE 853/tcp
+
+# Prepare shared directories
+VOLUME /config
+VOLUME /storage

contrib/container/README.md

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+# NSD Container
+
+## Build
+
+Build container using:
+
+   docker build -f contrib/container/Dockerfile -t nsd .
+
+## Runtime
+
+Configuration stored in `/config` and volatile data in `/storage`.

contrib/container/entrypoint.sh

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+#!/bin/bash
+
+if [ ! -d /storage/zones ]; then
+	install -d -o nsd -g nsd -m 775 /storage/zones
+fi
+
+if [ ! -f /config/nsd_control.key ]; then
+	nsd-control-setup
+fi
+
+nsd -d $NSD_OPTIONS

contrib/container/nsd.conf

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+# template nsd.conf for containers
+
+server:
+  username: nsd
+  zonesdir: /storage/zones
+  database: /storage/nsd.db
+  pidfile: /var/run/nsd.pid
+
+remote-control:
+  control-enable: yes
+  control-interface: lo