Fix sync workflow for filtering files (#904)

* Fix changed files filter

* Simplify

* Try to fix multi-line syntax

Author: krassowski

.github/workflows/sync_lab_release.yml

@@ -105,12 +105,21 @@ jobs:
           yarn clean_env_installer && conda-lock install --no-validate-platform --prefix ./env_installer/jlab_server ./env_installer/conda-osx-arm64.lock
           yarn update_binary_sign_list --platform osx-arm64
 
+      - name: Get changed files
+        id: changed-files
+        run: |
+          git diff --name-only > changed_files.txt
+          echo "files<<EOF" >> $GITHUB_OUTPUT
+          cat changed_files.txt >> $GITHUB_OUTPUT
+          echo "EOF" >> $GITHUB_OUTPUT
+
       - name: Upload updated repo as artifact
         uses: actions/upload-artifact@v4
         with:
           name: updated-repo
           path: |
-            $(git diff --name-only)
+            ${{ steps.changed-files.outputs.files }}
+          if-no-files-found: error
 
   push-and-pr:
     needs: [check-latest-version, update-files]