Backend and frontend images (langflowai/langflow-backend and
langflowai/langflow-frontend) are separate from the main image
(langflowai/langflow), so they should not be skipped when the
main version already exists on Docker Hub.
This fixes the issue where backend/frontend builds for 1.9.0
were skipped because the main 1.9.0 image was already published,
preventing these critical images from being available on Docker Hub.
Fixes: Backend and frontend Docker images not published in 1.9.0 release
(cherry picked from commit 595587027d)
0659105762