Remove onbuild and go-wrapper from Docker build

onbuild images [0] are deprecated
go-wrapper [1] is deprecated

[0] docker-library/official-images#2076
[1] docker-library/golang#205

Dockerfile

@@ -1,3 +1,9 @@
-FROM golang:onbuild
-ENTRYPOINT ["go-wrapper", "run"]
-CMD [""]
+FROM golang:latest as build
+WORKDIR /go/src/app
+COPY . .
+RUN go get -d -v ./...
+RUN go install -v ./...
+
+FROM debian:buster
+COPY --from=build /go/bin/app /
+ENTRYPOINT ["/app"]