chore: fix tag_name

.github/workflows/build.yml

@@ -16,6 +16,9 @@ on:
     types: [opened, synchronize, reopened]
     paths: ['**/CMakeLists.txt', '**/Makefile', '**/*.h', '**/*.hpp', '**/*.c', '**/*.cpp', '**/*.cu']
 
+env:
+  BRANCH_NAME: ${{ github.head_ref || github.ref_name }}
+
 jobs:
   ubuntu-latest-cmake:
     runs-on: ubuntu-latest