Attempt to fix windows CI

Attempt #2 to fix windows CI

Attempt to fix Windows CI #3

.github/workflows/build-and-test.yml

@@ -45,9 +45,19 @@ jobs:
 
       - name: Use OCaml ${{ matrix.ocaml-compiler }}
         uses: ocaml/setup-ocaml@v2
+        if: matrix.os != 'windows-latest'
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
 
+      - name: Use OCaml ${{ matrix.ocaml-compiler }} (Win)
+        uses: ocaml/setup-ocaml@v2
+        if: matrix.os == 'windows-latest'
+        with:
+          ocaml-compiler: ${{ matrix.ocaml-compiler }}
+          opam-repositories: |
+            opam-repository-mingw: https://github.com/ocaml-opam/opam-repository-mingw.git#sunset
+            default: https://github.com/ocaml/opam-repository.git
+
       - name: Install opam packages
         run: opam install .
 
@@ -86,12 +96,12 @@ jobs:
         run: |
           git config --global user.name github-actions[bot]
           git config --global user.email github-actions[bot]@users.noreply.github.com
-    
+
       - name: Install deps on Unix
         run: |
           opam install . --deps-only
           opam exec -- make coverage-deps install-test-deps
       - run: opam exec -- make test-coverage
         env:
           COVERALLS_REPO_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          PULL_REQUEST_NUMBER: ${{ github.event.number }}
+          PULL_REQUEST_NUMBER: ${{ github.event.number }}