fix: buildx issue with provenance disabled

Author: andyzhangx

Makefile

@@ -119,6 +119,7 @@ container: blob
 .PHONY: container-linux
 container-linux:
 	docker buildx build --pull --output=type=$(OUTPUT_TYPE) --platform="linux/$(ARCH)" \
+		--provenance=false --sbom=false \
 		-t $(IMAGE_TAG)-linux-$(ARCH) --build-arg ARCH=$(ARCH) -f ./pkg/blobplugin/Dockerfile .
 
 .PHONY: blob-container

hack/boilerplate/boilerplate.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2019 The Kubernetes Authors.
 #
@@ -207,4 +207,4 @@ def main():
     return 0
 
 if __name__ == "__main__":
-    sys.exit(main())
+    sys.exit(main())