Add Dockerfile

Dockerfile

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+FROM golang:1.14-alpine as build-env
+RUN mkdir /work
+RUN mkdir /work/out
+WORKDIR /work
+# Get dependencies first so they can be cached as a layer
+COPY go.mod .
+COPY go.sum .
+RUN go mod download
+# Copy the source code
+COPY . .
+# Build the executable binary
+RUN GOOS=linux GOARCH=amd64 go build -o out ./...
+
+FROM alpine:latest
+# Install CA certs and some tools for debugging
+RUN apk --update --no-cache add ca-certificates bash curl
+WORKDIR /root/
+# Copy the binary from the build-env stage
+COPY --from=build-env /work/out/placeholder-name app
+# Document the port
+EXPOSE 8080
+# Set the command
+CMD ["./app"]