chore: add Dockerfile

Dockerfile

@@ -0,0 +1,17 @@
+FROM golang:latest as builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . ./
+RUN CGO_ENABLED=0 go build -o short .
+
+FROM alpine:latest
+RUN apk --no-cache add ca-certificates
+
+WORKDIR /app
+COPY --from=builder /app/short /short
+
+ENTRYPOINT ["/short"]