dockerfile: update

Dockerfile

@@ -10,7 +10,7 @@ RUN go env -w GO111MODULE=on && \
     go env -w CGO_ENABLED=0 && \
     go env -w GOARCH=amd64 && \
     go env -w GOOS=linux && \
-    go build -o ./bin/kptTmrGroup -ldflags "-X kpt.kptyun.cn:3000/kpt-event/kpt-pasture/pod.appVersion=beef" main.go
+    go build -o ./bin/kptPasture -ldflags "-X kpt.kptyun.cn:3000/kpt-event/kpt-pasture/pod.appVersion=beef" main.go
 
 
 FROM alpine:latest