Add SPDDK build

serving/spdk/Dockerfile

@@ -0,0 +1,39 @@
+# Build SPDK's nvmf_tgt from source.
+#
+# There is no reliable official `spdk/spdk` image to pull (SPDK's guidance is to
+# build your own — https://spdk.io/doc/containers.html), so we compile a pinned
+# release here. Single-stage: the image is large and the FIRST build is slow
+# (~10-20 min — it pulls submodules incl. DPDK and compiles them), but it's
+# self-contained, reproducible, and cached thereafter. Bump SPDK_VERSION to a
+# tag from https://github.com/spdk/spdk/releases.
+FROM ubuntu:24.04
+
+ARG SPDK_VERSION=v24.09
+ARG SPDK_REPO=https://github.com/spdk/spdk
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends git ca-certificates \
+ && rm -rf /var/lib/apt/lists/*
+
+# Shallow-clone the pinned release; submodules at their pinned commits.
+RUN git clone --branch "${SPDK_VERSION}" --depth 1 "${SPDK_REPO}" /spdk \
+ && git -C /spdk submodule update --init --recursive
+
+# SPDK's own dependency installer (kernel headers, build tools, DPDK deps,
+# python for rpc.py, …). Then configure (TCP nvmf transport is in the default
+# build; trim the test artifacts) and build.
+RUN /spdk/scripts/pkgdep.sh \
+ && cd /spdk \
+ && ./configure --disable-tests --disable-unit-tests \
+ && make -j"$(nproc)"
+
+# nvmf_tgt lives in build/bin; rpc.py in scripts/ (kept ON PATH so its relative
+# imports resolve from the source tree). spdk-setup.sh locates both via `command
+# -v`. LD_LIBRARY_PATH is defensive in case of a shared-lib build.
+ENV PATH=/spdk/build/bin:/spdk/scripts:$PATH \
+    LD_LIBRARY_PATH=/spdk/build/lib:/spdk/dpdk/build/lib
+
+# spdk-setup.sh is bind-mounted at /spdk-setup.sh and set as the entrypoint by
+# docker-compose.yml.