Merge pull request #2944 from guardian/mm/chromatic-turbosnap-main

Chromatic | Turn on TurboSnap for `main`

Author: coldlink

.github/workflows/chromatic.yml

@@ -38,4 +38,4 @@ jobs:
           # Turn on Turbosnap, so we try to check only components that
           # have changed using the webpack dependency graph.
           # https://www.chromatic.com/docs/turbosnap
-          onlyChanged: '!(main)' # only turbosnap on non-main branches
+          onlyChanged: true