chore: reduce the docker image size (#1633)

* chore: reduce the docker image size

* chore: format dockerfile

tools/goctl/docker/template.go

@@ -15,6 +15,8 @@ LABEL stage=gobuilder
 ENV CGO_ENABLED 0
 ENV GOOS linux
 {{if .Chinese}}ENV GOPROXY https://goproxy.cn,direct
+{{end}}{{if .HasTimezone}}
+RUN apk update --no-cache && apk add --no-cache tzdata
 {{end}}
 WORKDIR /build
 
@@ -28,9 +30,10 @@ COPY . .
 
 FROM alpine
 
-RUN apk update --no-cache && apk add --no-cache ca-certificates tzdata
-ENV TZ Asia/Shanghai
-
+RUN apk update --no-cache && apk add --no-cache ca-certificates
+{{if .HasTimezone}}COPY --from=builder /usr/share/zoneinfo/{{.Timezone}} /usr/share/zoneinfo/{{.Timezone}}
+ENV TZ {{.Timezone}}
+{{end}}
 WORKDIR /app
 COPY --from=builder /app/{{.ExeFile}} /app/{{.ExeFile}}{{if .Argument}}
 COPY --from=builder /app/etc /app/etc{{end}}