Update to the latest dependency versions and use distroless/static:nonroot image

Dockerfile

@@ -1,4 +1,4 @@
-ARG GOLANG_VERSION="1.16.5"
+ARG GOLANG_VERSION="1.19.1"
 
 FROM golang:$GOLANG_VERSION-alpine as builder
 RUN apk --no-cache add tzdata
@@ -6,8 +6,6 @@ WORKDIR /go/src/github.com/serjs/socks5
 COPY . .
 RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags '-s' -o ./socks5
 
-FROM scratch
-COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
-COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+FROM gcr.io/distroless/static:nonroot
 COPY --from=builder /go/src/github.com/serjs/socks5/socks5 /
 ENTRYPOINT ["/socks5"]