Multi phase Go 1.11 module builder and scratch container for a swagger web service

Dockerfile

FROM golang:1.11.1 AS builder
WORKDIR /src

#avoid downloading the dependencies on succesive builds
COPY go.mod go.sum ./
RUN go mod download
RUN go mod verify

COPY . .
RUN mkdir -p ./build/
#GO111MODULE=on is optional, but just in case you want to put the project inside the GOPATH ...
RUN env GO111MODULE=on go test -race ./...
#compiling without CGO, so we do not depend on libraries that are missing on scratch
RUN env GO111MODULE=on CGO_ENABLED=0 go build -o ./build/pseudoservice ./cmd/pseudo-service-server/main.go

FROM scratch
COPY --from=builder /src/build/pseudoservice .
ENV PORT=8080
EXPOSE 8080

#example params for a goswagger.io generated service
#listening on all interfaces 0.0.0.0 is important!
ENTRYPOINT ["./pseudoservice", "--read-timeout=1s", "--write-timeout=1s", "--keep-alive=15s", "--listen-limit=1024", "--max-header-size=3KiB", "--host=0.0.0.0"]

Because scratch does not have SH or other utilities, see here how can you debug it:

https://medium.com/@rothgar/how-to-debug-a-running-docker-container-from-a-separate-container-983f11740dc6