Add the announcement for opam 2.3.0~beta1 (#2776)

* Add the announcement for opam 2.3.0~beta1

* line editing

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Co-authored-by: Christine Rose <[email protected]>

data/changelog/opam/2024-10-15-opam-2-3-0-beta1.md

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+---
+title: "opam 2.3.0~beta1"
+authors: [
+  "Raja Boujbel",
+  "Kate Deplaix",
+  "David Allsopp",
+]
+description: "Release of opam 2.3.0~beta1"
+tags: [opam, platform]
+---
+
+_Feedback on this post is welcome on [Discuss](https://discuss.ocaml.org/t/ann-opam-2-3-0-beta1/15450)!_
+
+We're happy to announce the first beta release of opam 2.3.0.
+Compared to the previous 2.3.0\~alpha1 release, you can view the full list of changes in the
+[release note](https://github.com/ocaml/opam/releases/tag/2.3.0-beta1).
+
+This version is a beta, so we invite users to test it to spot previously
+unnoticed bugs as we head towards the stable release.
+
+## Changes
+
+* Fix an opam 2.1 regression where the initial pin of a local VCS directory would store untracked and ignored files.
+  Those files would usually be cleaned before building the package; however, Git submodules would not be cleaned and would cause issues when paired with the new behaviour added in 2.3.0\~alpha1, which makes an opam error when Git submodules fail to update (it was previously a warning). ([#5809](https://github.com/ocaml/opam/issues/5809))
+
+* Fix a regression which would make opam crash on platforms where `getconf LONG_BIT` is not available (e.g., OpenBSD). ([#6215](https://github.com/ocaml/opam/issues/6215))
+
+* Fix the installed packages internal cache, which was storing the wrong version of the opam file after a build failure.
+  This could be triggered easily for users with custom repositories with non-populated extra-files. ([#6213](https://github.com/ocaml/opam/pull/6213))
+
+* Fix a regression in lint W59 with local URLs that are not archives. ([#6218](https://github.com/ocaml/opam/issues/6218))
+
+* Fix the compilation of opam on Windows with OCaml >= 5.0 (again)
+
+* Several improvements to the prebuilt release binaries were made:
+  * The Linux binaries are now built on Alpine 3.20
+  * The FreeBSD binary is now built on FreeBSD 14.1
+  * The OpenBSD binary is now built on OpenBSD 7.6 and loses support for OpenBSD 7.5 and older
+  * A Linux/riscv64 binary is now available
+
+API changes are denoted in the release note linked above.
+This release also includes a couple of PRs improving and extending the tests.
+
+## Try It!
+
+The upgrade instructions are unchanged:
+
+1. Either from binaries: run
+
+For Unix systems
+```
+bash -c "sh <(curl -fsSL https://opam.ocaml.org/install.sh) --version 2.3.0~beta1"
+```
+or from PowerShell for Windows systems
+```
+Invoke-Expression "& { $(Invoke-RestMethod https://opam.ocaml.org/install.ps1) } -Version 2.3.0~beta1"
+```
+or download manually from [the GitHub "Releases" page](https://github.com/ocaml/opam/releases/tag/2.3.0-beta1) to your PATH.
+
+2. Or from source, manually: see the instructions in the [README](https://github.com/ocaml/opam/tree/2.3.0-beta1#compiling-this-repo).
+
+
+You should then run:
+```
+opam init --reinit -ni
+```
+
+
+Please report any issues to [the bug-tracker](https://github.com/ocaml/opam/issues).
+
+Happy hacking!