Add debug outputs

Signed-off-by: ZePan110 <ze.pan@intel.com>

Author: ZePan110

.github/workflows/pr-image-size.yml

@@ -43,7 +43,7 @@ jobs:
       - name: Build and check image sizes
         if: steps.changed-dockerfiles.outputs.files != ''
         run: |
-          set -e
+          set -x
           merged_commit=$(git log -1 --format='%H')
           echo "### Images size variations" >> $GITHUB_STEP_SUMMARY
           while IFS= read -r -d '' dockerfile; do