You do not want every commit or pull request to trigger a build on Bitrise.
If you have a specific commit that you don't want to trigger a build, you can simply include [skip ci] in the commit message. For example, you can set your commit message to:
This doesn't require a build, please [skip ci]
If you want to skip a build for a Pull Request, you just need to include the [skip ci] in the Pull Request title or description.