Setup a gitlab-ci pipeline for running "make bench".

.gitlab-ci.yml

+before_script:
+  - . $HOME/.opam/opam-init/variables.sh
+
+ci-bench:
+  script:
+    - misc/ci-bench.sh

misc/ci-bench.sh

+#!/bin/bash
+
+# runner:
+# apt-get install curl opam automake libgmp-dev zlib1g-dev
+# curl -L https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.deb.sh | bash
+# apt-get install gitlab-runner
+# gitlab-runner register
+#   https://gitlab.inria.fr/
+#   shell
+# su gitlab-runner
+# cd
+# opam init
+# opam install menhir alt-ergo
+
+set -e
+
+# configuration
+autoconf
+automake --add-missing 2> /dev/null || true
+./configure --enable-local
+
+# compilation
+make -j2
+
+# detection of provers
+bin/why3config --detect-provers
+
+# run the bench
+make bench