unikernel/duniverse/dune_/docker/dev.Dockerfile

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+# little dockerfile to debug CI issues
+FROM ocaml/opam
+RUN sudo ln -f /usr/bin/opam-2.1 /usr/bin/opam
+RUN opam init --reinit -ni
+RUN mkdir -p /home/opam/dune/_boot /home/opam/dune/_build && chown opam:opam /home/opam/dune/_boot /home/opam/dune/_build
+COPY Makefile Makefile
+COPY .ocamlformat .ocamlformat
+RUN --mount=type=cache,target=/var/cache/apt sudo apt-get update && sudo apt-get install -y pkg-config nodejs strace file linux-perf-5.10
+# XXX not really correct as we should copy dune's source and pin it first. But
+# this docker file is mostly useful for quickly figuring out CI issues, so we
+# aren't too concerned
+RUN opam update && make dev-depext && make dev-deps && rm .ocamlformat Makefile

unikernel/duniverse/dune_/docker/dev.yml

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+volumes:
+  _build:
+  _boot:
+services:
+  dune:
+    image: dune
+    user: opam
+    tty: true
+    privileged: true
+    cap_add:
+      - SYS_PTRACE
+      - SYS_ADMIN
+    security_opt:
+      - seccomp:unconfined
+    stdin_open: true
+    environment:
+      HISTFILE: /home/opam/dune/.git/.bash_history
+    volumes:
+      - ../:/home/opam/dune
+      - _build:/home/opam/dune/_build/
+      - _boot:/home/opam/dune/_boot/