Fix lint and add lint command

Author: RobertIndie

Makefile

@@ -32,3 +32,6 @@ pulsarctl:
 .PHONY: install
 install:
 	go install github.com/streamnative/pulsarctl
+
+lint-docker:
+	docker run --rm -v $(shell pwd):/app -w /app golangci/golangci-lint:v2.7.2 golangci-lint run -v

pkg/ctl/functions/get_test.go

@@ -70,7 +70,9 @@ func TestGetFunctionsWithFailure(t *testing.T) {
 	_, err := os.Create(jarName)
 	assert.Nil(t, err)
 
-	defer os.Remove(jarName)
+	defer func(name string) {
+		_ = os.Remove(name)
+	}(jarName)
 	args := []string{"create",
 		"--tenant", "public",
 		"--namespace", "default",

pkg/ctl/functions/putstate_test.go

@@ -159,7 +159,9 @@ func TestByteValue(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer os.Remove(file.Name())
+	defer func(name string) {
+		_ = os.Remove(name)
+	}(file.Name())
 	if _, err := file.Write([]byte(buf)); err != nil {
 		t.Fatal(err)
 	}

pkg/ctl/functions/stop_test.go

@@ -78,7 +78,9 @@ func TestStopFunctionsWithFailure(t *testing.T) {
 	_, err := os.Create(jarName)
 	assert.Nil(t, err)
 
-	defer os.Remove(jarName)
+	defer func(name string) {
+		_ = os.Remove(name)
+	}(jarName)
 	args := []string{"create",
 		"--tenant", "public",
 		"--namespace", "default",