fix CI!

Author: mydea

.github/workflows/build.yml

@@ -191,7 +191,7 @@ jobs:
     steps:
       - name: PR is opened against master
         uses: mshick/add-pr-comment@v2
-        if: ${{ github.head_ref == 'refs/heads/master' && github.ref != 'refs/heads/develop' }}
+        if: ${{ github.base_ref == 'refs/heads/master' && github.head_ref != 'refs/heads/develop' }}
         with:
           message: |
             ⚠️ This PR is opened against **master**. You probably want to open it against **develop**.