Add sourcesecret and kustomization manifestgen

This includes a change to the `sync` generator to make the deploy
secret name configurable.

Signed-off-by: Hidde Beydals <hello@hidde.co>

pkg/manifestgen/sync/options.go

@@ -26,6 +26,7 @@ type Options struct {
 	Name              string
 	Namespace         string
 	Branch            string
+	Secret            string
 	TargetPath        string
 	ManifestFile      string
 	GitImplementation string
@@ -38,6 +39,7 @@ func MakeDefaultOptions() Options {
 		Name:              "flux-system",
 		Namespace:         "flux-system",
 		Branch:            "main",
+		Secret:            "flux-system",
 		ManifestFile:      "gotk-sync.yaml",
 		TargetPath:        "",
 		GitImplementation: "",