GHA: Show Cygwin version info after loading it from the cache

This is useful in case of a known Cygwin bug so we know if we need to clear the cache or not

Author: kit-ty-kate

.github/workflows/ci.ml

@@ -287,6 +287,7 @@ let cygwin_job ~analyse_job ~oc ~workflow f =
     ++ cache ~check_only:true Cygwin
     ++ checkout ~cond:(Predicate(true, CacheMiss cygwin64.id)) ()
     ++ build_cache Cygwin
+    ++ run ~shell:"cmd" "Cygwin info" [{|%CYGWIN_ROOT%\bin\uname -a|}]
     ++ end_job f
 
 let main_build_job ~analyse_job ~cygwin_job ?section runner start_version ~oc ~workflow f =

.github/workflows/main.yml

@@ -97,6 +97,9 @@ jobs:
       if: steps.cygwin64.outputs.cache-hit != 'true'
       shell: cmd
       run: .github\scripts\cygwin.cmd x86_64-pc-cygwin D:\Cache\cygwin create
+    - name: Cygwin info
+      shell: cmd
+      run: %CYGWIN_ROOT%\bin\uname -a
 
 ####
 # Build

master_changes.md

@@ -188,6 +188,7 @@ users)
   * Add OCaml 5.3 to the build matrix [#6192 @kit-ty-kate]
   * Add OCaml 5.3/MSVC to the build matrix [#6192 @kit-ty-kate]
   * Add a test making sure `opam init` works in the absence of `OPAMROOT` [#5663 @kit-ty-kate]
+  * Show Cygwin version info after loading it from the cache [#6383 @kit-ty-kate]
 
 ## Doc
   * Update the command to install opam to point to the new simplified url on opam.ocaml.org [#6226 @kit-ty-kate]