Revert removal of concurrency block

Author: vitaliyf

.github/workflows/ci-gradle.yml

@@ -7,6 +7,10 @@ on:
   release:
     types: [ released ]
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 permissions:
   contents: read