tools: make GH Actions workflows work if default branch is not master
The workflows should be able to work whether the default branch is named master or main. This should ease the transition if/when we switch to main in the future.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The workflows should be able to work whether the default branch is named master or main. This should ease the transition if/when we switch to main in the future.