Code deployment issues

[kjxbyz]

My code is hosted on GitHub. The repo has two branches: main and stable. The application is hosted on vercel. The application names correspond to app-dev and app-stg. I found several problems:

1. When I submit the code to the main branch, the production deployment of app-dev and the preview deployment of app-stg will be triggered.
2. When I submit the code to the stable branch, the production deployment of app-stg and the preview deployment of app-dev will be triggered.
3. When submitting PR to the main branch, the preview deployment of app-dev and app-stg will be triggered.
4. When the pr is submitted from the main branch to the stable branch, the preview deployment of app-dev and app-stg will also be triggered.

ideal situation

1. When I submit the code to the main branch, only the production deployment of app-dev is triggered.
2. When I submit the code to the stable branch, only the production deployment of app-stg is triggered.
3. When submitting PR to the main branch, only the preview deployment of app-dev is triggered.
4. When submitting PR from the main branch to the stable branch, only the preview deployment of app-stg is triggered.