Added Dockerfile

Dockerfile

@@ -0,0 +1,23 @@
+# build stage
+FROM golang:1.15 as builder
+ENV GO111MODULE=on
+
+WORKDIR /app
+
+COPY go.mod .
+COPY go.sum .
+
+RUN go mod download
+
+COPY . .
+
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o domainik-binary
+
+FROM alpine:3.10 as certs
+RUN apk add ca-certificates && update-ca-certificates
+
+# final stage
+FROM scratch
+COPY --from=builder /app/domainik-binary /app/
+COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+ENTRYPOINT ["/app/domainik-binary"]