chore: reduce docker image size

Author: go-bai

Dockerfile

@@ -1,10 +1,11 @@
 FROM golang:1.20-alpine AS builder
 RUN apk --no-cache add tzdata
+RUN apk add upx
 ENV GO111MODULE=on \
     CGO_ENABLED=0
 WORKDIR /build
 COPY . .
-RUN go mod tidy && go build -ldflags "-s -w" -o main
+RUN go mod tidy && go build -ldflags "-s -w" -o main && upx -9 main
 
 
 FROM scratch