btrfs-progs: ci: enable sanitizer checks for master branch

The CI passes on the 6.9 pre-release branch, we can enable it for all
future releases.

Signed-off-by: David Sterba <[email protected]>

Author: kdave

.github/workflows/ci-sanitize.yml

@@ -10,6 +10,7 @@ on:
   push:
     branches:
       - sanitize-test
+      - master
 jobs:
   build-ubsan:
     runs-on: ubuntu-latest