Maybe I've misunderstood, but why aren't you testing it locally? With trunk based development you make your changes, run a local build and push if it passes. Everyone (including any CI servers) runs the same build process.
The trick is that you have to be able to push to master without breaking it, which is scary to many developers and usually requires a shift in thinking. How do I do large refactorings? (you don't - do many small refactorings instead). How do I add a half-finished feature? (break the feature into many smaller features, use feature toggles, etc.)
