fix trailing whitespace check

<!-- ps-id: 839007f4-c7f9-4bc8-82e1-99e73a1e11f2 -->

Signed-off-by: Ali Caglayan <[email protected]>

Author: Alizter

.github/workflows/whitespace.yml

@@ -16,9 +16,11 @@ jobs:
 
     - name: Check for trailing whitespaces
       run: |
-        if git grep --cached -n --ignore-case --perl-regexp '\s$' :; then
-          echo "Trailing whitespaces found. Please remove with:\
-          etc/fix_trailing_whitespace.sh"
+        TRAILING_WHITESPACES=$(git grep -l -z -E '\s+$' | xargs -0 sed -n '/\s$/p')
+        if [ -n "$TRAILING_WHITESPACES" ]; then
+          echo "Trailing whitespaces found in the following files:"
+          echo "$TRAILING_WHITESPACES"
+          echo "Please remove them."
           exit 1
         fi