Export environment variables so bazelisk picks them up (#19690)

PiperOrigin-RevId: 705148623

Co-authored-by: Mike Kruskal <[email protected]>

Author: zhangskz

ci/push_auto_update.sh

@@ -19,6 +19,9 @@ if (echo "$previous_commit_title" | grep -q "^Auto-generate files"); then
   exit 0
 fi
 
+export BAZEL=bazelisk
+export USE_BAZEL_VERSION=7.2.1
+
 ./regenerate_stale_files.sh
 
 # Try to determine the most recent CL or pull request.