Updates

[Sudha247]

I'm using this PR to track the TODO items in ocaml#3132

TODO

• Use a pinned version of dune dev preview so the ocaml.org build does not break unexpectedly. Rationale: we sometimes needs to update on short notice and can't afford to have a broken build
• How do we do power clean? That is getting back to point were dune pkg needs to be initialised. Rationale: this is needed to measure first build time without using docker
• ocaml.org build is using ~/.cache/ocamlorg is dune pkg also using ~/.cache/dune. What's the impact of deleting it?
• Create a GitHub action that uses daily dune preview and current version of ocaml.org build as a regression/blackbox test. But let's not do that with the production version

[Sudha247]

How do we do power clean? That is getting back to point were dune pkg needs to be initialised. Rationale: this is needed to measure first build time without using docker

This is a matter of removing the Dune binary from ~/.local/bin and performing all the actions again. Initialising dune pkg isn't all that time consuming, but installed and building packages in the first instance is.

[Sudha247]

I've now verified that we can build with dune via opam, after removing the dune.lock/ directories in the root and in playground/.