Update build.yml to build on v4 branches

[skip ci]

Signed-off-by: Ashley <73482956+ascopes@users.noreply.github.com>

Author: ascopes

.github/workflows/build.yml

@@ -4,9 +4,11 @@ on:
   pull_request:
     branches:
       - main
+      - v*
   push:
     branches:
       - main
+      - v*
   workflow_call: {}
   workflow_dispatch: {}