Update cmake-multi-platform.yml

.github/workflows/cmake-multi-platform.yml

@@ -57,7 +57,7 @@ jobs:
     container:
       image: docker.io/centos:7
       volumes:
-        - ${{ github.workspace }}
+        - ${{ github.workspace }}:${{ github.workspace }}
 
     strategy:
       # Set fail-fast to false to ensure that feedback is delivered for all matrix combinations. Consider changing this to true when your workflow is stable.