try publish to open-vsx

Author: sumneko

.github/workflows/build.yml

@@ -92,3 +92,8 @@ jobs:
       - name: Publish VSCode market
         if: startsWith(github.ref, 'refs/tags/')
         run: vsce publish -i ${{ steps.vars.outputs.PKG_NAME }} -p ${{ secrets.VSCE_TOKEN }}
+
+      - name: Publish Open VSX market
+        run: |
+          npm install -g ovsx
+          ovsx publish ${{ steps.vars.outputs.PKG_NAME }} -p ${{ secrets.OVSX_TOKEN }}