Dockerfile added

Dockerfile

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+FROM golang:1.13 as build
+
+RUN go get github.com/BBVA/kapow
+RUN CGO_ENABLED=0 GOOS=linux go install github.com/BBVA/kapow
+
+FROM alpine:latest
+COPY --from=build /go/bin/kapow /usr/bin/kapow
+
+ENTRYPOINT /usr/bin/kapow