dune-pkg image variant#357
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Split the pipeline into independent opam and dune-pkg paths over shared helpers (Distro_util). Add an ocaml-base variant for `dune pkg` builds: ships dune + a baked relocatable compiler, no opam/switch/repo. Scoped to x86_64, apk/apt distros, OCaml >= 5.5. See docs/adr/0001, 0002. On tier-1 distros also build compiler variants (+flambda, +afl, +no-flat-float-array) via the upstream ocaml-options-only-* packages, mirroring how the opam images install variants.
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OCaml base Docker image with plain Dune, no opam or repo, but a prebuilt cached compiler. (5.5+). Much smaller in size, and fits a workflow where repo has a precomputed lock.
Pipeline split into independent
Pipeline_opam/Pipeline_duneand some shared bits, mostly for a quick an easy poc.Unclear if this is a good path; it seems a bit silly that you cannot, in a simple way, reuse an opam built with OCaml with Dune.