Support specifing sparseCheckout in flux bootstrap

Signed-off-by: piny940 <83708535+piny940@users.noreply.github.com>
Assisted-by: claude/opus-4.7

pkg/manifestgen/sync/options.go

@@ -34,6 +34,7 @@ type Options struct {
 	ManifestFile      string
 	RecurseSubmodules bool
 	Provider          string
+	SparseCheckout    []string
 }
 
 func MakeDefaultOptions() Options {

pkg/manifestgen/sync/sync.go

@@ -69,6 +69,7 @@ func Generate(options Options) (*manifestgen.Manifest, error) {
 			},
 			RecurseSubmodules: options.RecurseSubmodules,
 			Provider:          options.Provider,
+			SparseCheckout:    options.SparseCheckout,
 		},
 	}