Allow running benchmarks on pull requests

Makefile

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+.PHONY: bench
+
+
+bench:
+	dune build --profile benchmark bench/output.csv && \
+	cat /dev/urandom | ./_build/default/bench/zpipe | ./_build/default/bench/bench.exe -j

bench.Dockerfile

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+FROM ocaml/opam:debian-10-ocaml-4.13
+
+RUN sudo apt-get install -qq -yy --no-install-recommends zlib1g-dev pkg-config
+
+RUN opam exec -- opam remote add origin https://opam.ocaml.org
+
+RUN opam exec -- opam update
+
+COPY --chown=opam:opam . bench-dir
+
+WORKDIR bench-dir
+
+RUN opam exec -- opam install -y --deps-only ./decompress-bench.opam

decompress-bench.opam

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+opam-version: "2.0"
+name:         "decompress"
+maintainer:   "Romain Calascibetta <[email protected]>"
+authors:      "Romain Calascibetta <[email protected]>"
+homepage:     "https://github.com/mirage/decompress"
+bug-reports:  "https://github.com/mirage/decompress/issues"
+dev-repo:     "git+https://github.com/mirage/decompress.git"
+doc:          "https://mirage.github.io/decompress/"
+license:      "MIT"
+synopsis:     "Implementation of Zlib and GZip in OCaml"
+description: """Decompress is an implementation of Zlib and GZip in OCaml
+
+It provides a pure non-blocking interface to inflate and deflate data flow.
+"""
+
+build: [ "dune" "build" "-p" name "-j" jobs ]
+run-test: [ "dune" "runtest" "-p" name "-j" jobs ]
+
+depends: [
+  "ocaml"       {>= "4.07.0"}
+  "dune"        {>= "2.8.0"}
+  "base-bytes"
+  "bigarray-compat"
+  "cmdliner"    {>= "1.0.0"}
+  "optint"      {>= "0.1.0"}
+  "checkseum"   {>= "0.2.0"}
+  "bigstringaf" {with-test}
+  "alcotest"    {with-test}
+  "ctypes"      {with-test & >= "0.18.0"}
+  "fmt"         {with-test & >= "0.8.7"}
+  "camlzip"     {>= "1.10" & with-test}
+  "base64"      {>= "3.0.0" & with-test}
+  "crowbar"     {with-test & >= "0.2"}
+  "rresult"     {with-test}
+  "yojson"
+  "ppx_deriving_yojson"
+  "optint"
+  "landmarks" 
+  "fpath"
+  "rresult"
+   "bos"
+]