Update Dockerfile (#133)

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.14.2 as builder
+FROM golang:1.19 as builder
 
 # Copy in the go src
 WORKDIR /go/src/github.com/AliyunContainerService/kubernetes-cronhpa-controller
@@ -11,12 +11,12 @@ COPY vendor/ vendor/
 RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=off go build -a -o kubernetes-cronhpa-controller github.com/AliyunContainerService/kubernetes-cronhpa-controller/cmd/kubernetes-cronhpa-controller
 
 # Copy the controller-manager into a thin image
-FROM alpine:3.12.0
+FROM alpine:3.17
 RUN apk add --no-cache tzdata
 WORKDIR /root/
 COPY --from=builder /go/src/github.com/AliyunContainerService/kubernetes-cronhpa-controller/kubernetes-cronhpa-controller .
 COPY docker-entrypoint.sh .
 RUN chmod +x /root/docker-entrypoint.sh
 
 ENTRYPOINT  ["/root/docker-entrypoint.sh"]
-CMD ["/root/kubernetes-cronhpa-controller"]
+CMD ["/root/kubernetes-cronhpa-controller"]