Filter md

Author: janhohenheim

.github/workflows/ci.yml

@@ -27,7 +27,10 @@ jobs:
         else
             changed_files=$(git diff --name-only ${{ github.event.before }} ${{ github.event.after }} | xargs)
         fi
-        echo "changed_files=$(echo $changed_files | tr ' ' '\n' | grep -E '\.md$' | xargs)" >> $GITHUB_OUTPUT
+        # filter out non-markdown files
+        changed_files=$(echo "$changed_files" | grep -E '\.md$')
+        echo "changed_files: $changed_files"
+        echo "changed_files=$changed_files" >> $GITHUB_ENV
     - name: Lint
       uses: avto-dev/markdown-lint@v1
       with: