fix(CI): run 'ridk enable' before building the Ruby extension on windows, to activate the MSYS2 environment, installed by the Ruby installer

Author: nickysn

.github/workflows/ci.yml

@@ -53,7 +53,11 @@ jobs:
       - name: Setup just
         uses: extractions/setup-just@v1
       - name: Build extension
-        run: just build-extension
+        run: |
+          if [[ "$RUNNER_OS" == "Windows" ]]; then
+            ridk enable
+          fi
+          just build-extension
       - name: Run tests
         run: just test