Add hot reload capability for locally-managed tunnels. When a config file
is specified (without --token), cloudflared now watches for changes and
automatically reloads the configuration.
Features:
- File watching via fsnotify with 500ms debounce
- Fallback polling every 30s for symlink rotation (Kubernetes ConfigMaps)
- Manual reload via SIGHUP signal
- Graceful handling of invalid configs (keeps current config)
- Thread-safe with TryLock to skip concurrent reloads
New files:
- orchestration/local_config.go: Config file reading and validation
- orchestration/local_watcher.go: File watcher with reload logic
Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Aleksei Sviridkin <f@lex.la>
793912756b