Add Dockerfile

Dockerfile

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+FROM golang:1.14-alpine AS builder
+
+# Move to working directory (/build).
+WORKDIR /build
+
+# Copy and download dependency using go mod.
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy the code into the container.
+COPY . .
+
+# Set necessary environmet variables needed for our image and build the API server.
+ENV GO111MODULE=on CGO_ENABLED=0 GOOS=linux GOARCH=amd64
+RUN go build -ldflags="-w -s" -o apiserver .
+
+FROM scratch
+
+# Copy binary and config files from /build to root folder of scratch container.
+COPY --from=builder ["/build/apiserver", "/build/configs/apiserver.yml", "/"]
+
+# Export necessary port.
+EXPOSE 5000
+
+# Command to run when starting the container.
+ENV CONFIG_PATH=/apiserver.yml
+ENTRYPOINT ["/apiserver"]