[ANN] dune 3.9.0

The Dune team is pleased to announce the release of Dune 3.9.0. It comes with
many new features, including:

a new dune show command to display various pieces of information.
some fixes in the dialect support that will make it easier to work with Dream’s eml files
a new (build_if) toggle in the (test) stanza which will help packaging nonportable tests and benchmarks.

Added

Include the time it takes to read/write state files when --trace-file is
enabled (#7960, @rgrinberg)
Include source tree scans in the traces produced by --trace-file (#7937,
@rgrinberg)
Add --all option to dune rpc status to show all Dune RPC servers running.
(#8011, fix #7902, @Alizter)
Add additional metadata to the traces provided by --trace-file whenever
--trace-extended is passed (#7778, @rleshchinskiy)
$ dune describe is now a command group, so arguments to subcommands must be
passed after subcommand itself. (#7919, @Alizter)
Add dune show command group which is an alias of dune describe. (#7946,
@Alizter)
Add dune show env command and make dune printenv an alias of it. (#7985,
@Alizter)
Add commands dune show targets and dune show aliases that display all the
available targets and aliases in a given directory respectively. (#7770,
grants #265, @Alizter)
Extensions used in (dialect) can contain periods (e.g., cppo.ml). (#7782,
fixes #7777, @nojb)
The interface and implementation fields of a (dialect) are now optional
(#7757, @gpetiot)
Add (build_if) to the (test) stanza. When it evaluates to false, the
executable is not built. (#7899, fixes #6938, @emillon)
Allow (include_subdirs qualified) to be used when libraries define a
(modules ...) field (#7797, fixes #7597, @anmonteiro)
Allow multiple globs in library’s (stdlib (internal_modules ..))
(@anmonteiro, #7878)

Do not re-run OCaml syntax files on every iteration of the watch mode. This
is too memory consuming. (#7894, fix #6900, @rgrinberg)
Attach melange rules to the default alias (#7926, @haochenx)
Compute digests and manage sandboxes in background threads (#7947,
@rgrinberg)

Validate file extension for $ dune ocaml top-module. (#8005, fixes #8004,
@3Rafal)
Cinaps: The promotion rules for cinaps would only offer one file at a time no
matter how many promotions were available. Now we offer all the promotions at
once (#7901, @rgrinberg)
Add necessary parentheses in generated opam constraints (#7682, fixes #3431,
@Lucccyo)

Remove some compatibility code for old version of dune that generated
.merlin files. Now dune will never remove .merlin files automatically
(#7562)
In opam constraints, reject (and) and (or) with no arguments at parse
time (#7730, @emillon)

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