chore: add a new target mock in Makefile and update mock files

Signed-off-by: KentHsu <chiahaohsu9@gmail.com>

Makefile

@@ -1,6 +1,8 @@
 RELEASE_VERSION  =v1.0.0-rc-3
 GDOC_PORT        =8888
 GO_COMPAT_VERSION=1.21
+MOCKGEN_FORK     =github.com/golang/mock/mockgen
+MOCKGEN_VERSION  =v1.6.0
 
 .PHONY: all
 all: help
@@ -57,3 +59,11 @@ check-diff:
 .PHONY: modtidy
 modtidy:
 	go mod tidy
+
+.PHONY: mock
+mock: ## Generates mock files
+	go install $(MOCKGEN_FORK)@$(MOCKGEN_VERSION)
+	mockgen -source ./actor/manager/manager.go -destination ./actor/mock/mock_manager.go -package mock
+	mockgen -source ./actor/manager/container.go -destination ./actor/mock/mock_container.go -package mock
+	mockgen -source ./actor/codec/codec.go -destination ./actor/mock/mock_codec.go -package mock
+	mockgen -source ./client/client.go -destination ./actor/mock_client/mock_client.go -package mock_client