Docker build

Dockerfile

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+FROM golang:latest as builder
+ARG MOD
+ENV MOD ${MOD:-readonly}
+RUN mkdir /build
+ADD . /build/
+WORKDIR /build
+RUN echo "go mod flag: $MOD"
+RUN CGO_ENABLED=0 GOOS=linux go build -mod=$MOD -a -installsuffix cgo -ldflags '-extldflags "-static"' -o main .
+
+FROM alpine
+WORKDIR /app
+COPY --from=builder /build/main /app
+EXPOSE 8080
+CMD ["./main"]