Don't list log file as changes (jupyterlab#14700)

Author: fcollonval

.github/workflows/license-header.yml

@@ -35,10 +35,8 @@ jobs:
         shell: bash -l {0}
         run: |
           set -ex
-          export CHANGES=$(git status --porcelain | tee modified.log | wc -l)
-          cat modified.log
-          # Remove the log otherwise it will be committed
-          rm modified.log
+          export CHANGES=$(git status --porcelain | tee /tmp/modified.log | wc -l)
+          cat /tmp/modified.log
 
           echo "N_CHANGES=${CHANGES}" >> $GITHUB_OUTPUT