Add demo/bugbash branch triggers to release-build workflow

Replace the split-release-workflows branch trigger with demo-*
and bugbash-* patterns to match what release-snapshot.yml covers.

Co-authored-by: Isaac

Author: pietern

.github/workflows/release-build.yml

@@ -6,7 +6,8 @@ on:
       - "v*"
     branches:
       - "main"
-      - "split-release-workflows"
+      - "demo-*"
+      - "bugbash-*"
 
   workflow_dispatch: