Enable save for pull requests for testing

Author: iluuu1994

.github/actions/ccache/action.yml

@@ -21,4 +21,4 @@ runs:
         key: "${{ steps.cache_key.outputs.key }}"
         append-timestamp: false
         restore-keys: "${{ steps.cache_key.outputs.prefix }}"
-        save: ${{ github.event_name != 'pull_request' }}
+        #save: ${{ github.event_name != 'pull_request' }}