Fix fuzzy CI

[Tim-ats-d]

• Update from OCaml 5.3 to 5.5
• Update Merl-an CLI usage
• Regenerate Irmin lock file using this method:

$ opam switch create ocaml-base-compiler.5.5.0
$ opam switch ocaml-base-compiler.5.5.0
$ git clone https://github.com/mirage/irmin
$ git checkout 7fa4b043a97944635cc100ae2e7dd85f73d8a4ce # The release commit hash of the release of Irmin version 3.10
$ opam install opam-monorepo
$ opam repository add dune-universe git+https://github.com/dune-universe/opam-overlays.git
$ opam-monorepo lock irmin irmin-pack irmin-tezos --ocaml-version=5.5.0 

Merging this PR should close that issue #2006

[Tim-ats-d]

Thanks for the review

[Tim-ats-d]

Why does it fail now? 🤔 The ppxlib version 0.38 seems to support OCaml 5.5 and the ppxlib version has been fixed accordingly in the lock file.

[voodoos]

Why does it fail now? 🤔

Because that's what CIs are for 😂

[voodoos]

Why does it fail now? 🤔 The ppxlib version 0.38 seems to support OCaml 5.5 and the ppxlib version has been fixed accordingly in the lock file.

Can you add prints right before building irmin to check the ppxlib version ?

[voodoos]

🤷‍♂️

[voodoos]

I suspect the variable expansion doesn't work here, you might need quotes ".github/fuzzy-ci-helpers/irmin.$IRMIN_VERSION.opam.locked"

[Tim-ats-d]

I've quoted all the IRMIN_VERSION variable expansion and it has no effect

[Tim-ats-d]

Maybe the Opam monorepo has not been upgraded to OCaml 5.5?

[voodoos]

Maybe the Opam monorepo has not been upgraded to OCaml 5.5?

Didn't you say it used to work on your machine / fork ?

[voodoos]

My new print shows the the irmin.opam.locked file we get is not the one we expect.

[voodoos]

Ah I think I get it ! We checkout the main branch before copying the lock file 😅
I am going to push the lockfile first

[voodoos]

🙌

[Tim-ats-d]

Nice, good catch!