Run benchmarks on OCaml 5.1

Author: polytypic

.dockerignore

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+_build

bench.Dockerfile

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+FROM ocaml/opam:debian-ocaml-5.1
+RUN sudo ln -sf /usr/bin/opam-2.1 /usr/bin/opam
+WORKDIR bench-dir
+RUN opam remote add origin https://opam.ocaml.org && \
+    opam update
+COPY *.opam ./
+RUN opam pin -yn --with-version=dev .
+RUN opam install -y --deps-only --with-test .
+COPY . ./
+RUN opam exec -- dune build --release bench/main.exe