CI: add package-grokker

.github/workflows/main.yml

@@ -64,3 +64,21 @@ jobs:
         with:
           name: sources
           path: C:/_/artifacts/*.src.tar.*
+
+  package-grokker:
+    runs-on: ubuntu-latest
+    needs: build
+
+    steps:
+      - uses: actions/download-artifact@v3
+        id: artifacts
+        continue-on-error: true
+        with:
+          name: msys2-packages
+          path: artifacts
+      - name: Grok packages
+        uses: jeremyd2019/package-grokker/grok-artifacts@main
+        if: steps.artifacts.outcome == 'success'
+        with:
+          repo: msys
+          path: artifacts