condition fix

Author: connorhu

.github/workflows/archive-validation.yml

@@ -31,5 +31,5 @@ jobs:
 
       - run: |
           git archive -o archive.tar $GITHUB_SHA && sh .ci/github/validate_archive.sh archive.tar
-        if: ${{ $NO_OF_FILES_CHANGED_IN_ROOT > 0 }}
+        if: ${{ env.NO_OF_FILES_CHANGED_IN_ROOT > 0 }}