Revert "[change] : Shllcheck warning"

This reverts commit bc889a2.

Author: Hayao0819

.github/workflows/shellcheck.yml

@@ -29,6 +29,6 @@ jobs:
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@master
         with:
-          severity: warning
+          severity: error
         env:
           SHELLCHECK_OPTS: --shell=bash