[new release] irmin project (3.5.1)

[metanivek]

Project page: https://github.com/mirage/irmin

CHANGES:

Fixed

• irmin-pack
  • Integrity check of a commit works on stores using the minimal indexing
    strategy. (Fix integrity check command for minimal indexing stores mirage/irmin#2160, @icristescu)

[metanivek]

I don't think any of the CI failures are related to this release.

[raphael-proust]

The CI errors seem to fall in the following categories:

• Timeouts (I've restarted those)
• Network errors when installing system packages (same)
• ld exists with 1 on the more exotic architectures
• ca-cert issue on macos protected build env

I don't think those errors should block this PR

[kit-ty-kate]

• The macos errors should be restricted at the opam file level (disable the tests on macos)
• The mtime link failures seem related too. Could you have a look at them?

[metanivek]

@kit-ty-kate

I disabled tests for macos with the packages that are failing. CI is running again but these errors should disappear. The libirmin build is also failing macos but I did not remove its availability on that platform. This package does work on macos but unfortunately suffers from this known issue on opam CI: mirage/ca-certs#20.

As for mtime, I can't quite figure this one out. Is this an mtime issue or an irmin one? All the linking failures are happening on "exotic" (as @raphael-proust puts it 😄) architectures, but also all the failures are when building with OCaml 5. I'm happy to adjust something within Irmin but not sure what I would do (if there is indeed anything I can).

Thanks for the reviews @kit-ty-kate and @raphael-proust.

[samoht]

I don't understand what are the mtime failures. Merging as is as most of the "base" tests pass fine, but happy to take follow fixes.