Fix dpdk build deps

serving/spdk/Dockerfile

@@ -26,8 +26,13 @@ RUN git clone --branch "${SPDK_VERSION}" --depth 1 "${SPDK_REPO}" /spdk \
 # build; trim the test artifacts) and build.
 # apt-get update first: the index was cleared above, and pkgdep.sh runs
 # `apt-get install` without refreshing it (else "Unable to locate package …").
+#
+# pkgdep.sh on Ubuntu 24.04 installs meson/pyelftools into a Python venv (PEP 668),
+# so they aren't on PATH where DPDK's make invokes bare `meson`/`ninja`. Install
+# the DPDK build tools globally too (meson, ninja-build, python3-pyelftools).
 RUN apt-get update \
  && /spdk/scripts/pkgdep.sh \
+ && apt-get install -y --no-install-recommends meson ninja-build python3-pyelftools \
  && cd /spdk \
  && ./configure --disable-tests --disable-unit-tests \
  && make -j"$(nproc)" \