Add DO NOT EDIT warn to bootstrap sync manifests

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

pkg/manifestgen/manifest.go

@@ -24,6 +24,8 @@ import (
 	securejoin "github.com/cyphar/filepath-securejoin"
 )
 
+const GenWarning = "# This manifest was generated by flux bootstrap. DO NOT EDIT."
+
 // Manifest holds the data of a multi-doc YAML
 type Manifest struct {
 	// Relative path to the YAML file

pkg/manifestgen/sync/sync.go

@@ -107,7 +107,7 @@ func Generate(options Options) (*manifestgen.Manifest, error) {
 
 	return &manifestgen.Manifest{
 		Path:    path.Join(options.TargetPath, options.Namespace, options.ManifestFile),
-		Content: fmt.Sprintf("---\n%s---\n%s", resourceToString(gitData), resourceToString(ksData)),
+		Content: fmt.Sprintf("%s\n---\n%s---\n%s", manifestgen.GenWarning, resourceToString(gitData), resourceToString(ksData)),
 	}, nil
 }