Presently with the branch updater merging strategy, commits to master don`t trigger branches and as a result there is no auto trigger on the branches. It will be a good option to have such a feature.

Workaround
1. Create a new repository that points to the same master branch and set up that second master repository to trigger all the branches. I will attach screenshots to illustrate.
2. Create a separate plan for the feature branch and set up build dependency