fix(ci): update is_stable code

Author: rdlabo

.github/workflows/release.yml

@@ -77,7 +77,7 @@ jobs:
       - name: Publish packages
         run: |
           VERSION="${{ steps.tag_version.outputs.version }}"
-          IS_STABLE=$(echo "$VERSION" | grep -E '^[0-9]+\.[0-9]+\.[0-9]+$' && echo "true" || echo "false")
+          IS_STABLE=$(echo "$VERSION" | grep -Eq '^[0-9]+\.[0-9]+\.[0-9]+$' && echo true || echo false)
           
           for workspace in ${{ steps.workspaces.outputs.list }}; do
             echo "Publishing $workspace..."