Build snapshot releases for bugbash branches (#1948)

## Changes

To be used with
https://github.com/databricks/cli/tree/main/internal/bugbash.

## Tests

n/a

.github/workflows/release-snapshot.yml

@@ -5,6 +5,7 @@ on:
     branches:
       - "main"
       - "demo-*"
+      - "bugbash-*"
 
   # Confirm that snapshot builds work if this file is modified.
   pull_request: