add Dockerfile

Dockerfile

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+# Prepare
+FROM golang:1.13-alpine as baseimg
+
+RUN apk --no-cache upgrade && apk --no-cache add git make
+
+# First only download the dependencies, so thid layer can be cahced before we copy the code
+COPY ./go.mod ./go.sum ./Makefile /app/
+WORKDIR /app/
+RUN make deps
+
+# Build
+FROM baseimg as builder
+
+COPY . ./
+RUN make build
+
+# Run
+FROM alpine
+
+COPY --from=builder /app/go-skeleton /opt/
+WORKDIR /opt/
+ARG ENV
+EXPOSE 8000
+CMD ["./go-skeleton"]