chore: initial import from KNEL/PFVCluster@041d311 [#769]

Split per O&M lane work order. Full history: KNEL/PFVCluster.
https://projects.knownelement.com/issues/769#note-4152

bench/Dockerfile

@@ -0,0 +1,15 @@
+# perfbench container — #709. Same toolset as the fleet LXC/guest installer.
+# Build: docker build -t git.knownelement.com/reachableceo/perfbench:1.0 .
+FROM debian:12-slim
+
+RUN apt-get update -qq && apt-get install -y -qq --no-install-recommends \
+        fio iperf3 jq libaio1 ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY bench-run.sh /usr/local/bin/bench-run.sh
+RUN chmod +x /usr/local/bin/bench-run.sh
+
+# storage bench: mount the path to test at /mnt/bench
+# network bench: run as server: docker run ... bench-run.sh --server
+ENV BENCH_DIR=/mnt/bench
+ENTRYPOINT ["/usr/local/bin/bench-run.sh"]