Add runtime and nqptp image targets to the ohm Dockerfile

The runtime image carries only shairport-sync and its libraries and
expects the node's avahi via the host D-Bus socket; nqptp runs as a
sidecar sharing /dev/shm.

docker/Dockerfile.ohm

@@ -60,7 +60,53 @@ RUN ../configure --sysconfdir=/etc --with-alsa \
         --with-dbus-interface --with-mpris-interface \
         --with-convolution --with-soxr
 RUN make -j"$(nproc)"
+RUN make install DESTDIR=/install
 
 # Target that yields just the binary on the host filesystem via --output.
 FROM --platform=linux/arm64 scratch AS binary
 COPY --from=builder /shairport-sync/build/shairport-sync /shairport-sync
+
+# nqptp sidecar image for AirPlay 2 timing; shares /dev/shm with the
+# shairport-sync container (see k8s/shairport-ohm.yaml).
+FROM --platform=linux/arm64 debian:${DEBIAN_VERSION} AS nqptp-build
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        build-essential autoconf automake libtool git ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+RUN git clone --depth=1 https://github.com/mikebrady/nqptp /nqptp
+WORKDIR /nqptp
+RUN autoreconf -i && ./configure && make
+
+FROM --platform=linux/arm64 debian:${DEBIAN_VERSION}-slim AS nqptp
+COPY --from=nqptp-build /nqptp/nqptp /usr/local/bin/nqptp
+ENTRYPOINT ["/usr/local/bin/nqptp"]
+
+# Deployable runtime image. Uses the node's avahi (host D-Bus socket mounted)
+# and the nqptp sidecar (shared /dev/shm); see k8s/shairport-ohm.yaml.
+#
+#   docker buildx build --platform linux/arm64 --target runtime \
+#     -t <registry>/shairport-sync-ohm:latest -f docker/Dockerfile.ohm --push .
+#   docker buildx build --platform linux/arm64 --target nqptp \
+#     -t <registry>/nqptp:latest -f docker/Dockerfile.ohm --push .
+FROM --platform=linux/arm64 debian:${DEBIAN_VERSION}-slim AS runtime
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        libasound2 \
+        libavahi-client3 \
+        libavcodec58 \
+        libavformat58 \
+        libavutil56 \
+        libconfig9 \
+        libgcrypt20 \
+        libglib2.0-0 \
+        libplist3 \
+        libpopt0 \
+        libsndfile1 \
+        libsodium23 \
+        libsoxr0 \
+        libssl1.1 \
+        libswresample3 \
+        libuuid1 \
+    && rm -rf /var/lib/apt/lists/*
+COPY --from=builder /install/usr/local/bin/shairport-sync /usr/local/bin/shairport-sync
+ENTRYPOINT ["/usr/local/bin/shairport-sync"]