Merge pull request #28806 from jmid/print-opam-var

Print opam variables (os, os-distribution, os-family, ...) in Windows workflows

Author: mseri

.github/workflows/windows.yml

@@ -78,6 +78,7 @@ jobs:
         run: |
           opam --version
           opam exec -- ocaml -version
+          opam var
 
       - name: Get changed files
         id: changed-files