ci(publish): export variable and create directory for assets

Update the GitHub Actions workflow to export the RELEASE_ASSETS_PATH variable and ensure the directory is created before usage.
This change prevents errors related to missing directories when renaming artifacts.

Author: tanguc

.github/workflows/publish.yml

@@ -49,7 +49,8 @@ jobs:
 
       - name: rename artifacts from zip folders
         run: |
-          $RELEASE_ASSETS_PATH="release-assets" # specific to release-it.json config
+          export RELEASE_ASSETS_PATH="release-assets" # specific to release-it.json config
+          mkdir -p "$RELEASE_ASSETS_PATH"
           for dir in */ ; do
             arch="${dir%/}"
             if [ -f "$dir/oneseal" ]; then