Add Dockerfile

Dockerfile

@@ -0,0 +1,16 @@
+# build
+FROM golang:alpine AS build
+
+COPY go.mod /workspace/
+COPY main.go /workspace/
+WORKDIR /workspace
+RUN go mod download
+RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o blitzwing .
+
+# runtime
+
+FROM busybox:musl AS runtime
+COPY --from=build /workspace/blitzwing blitzwing
+RUN chmod +x blitzwing
+CMD ["./blitzwing"]
+EXPOSE 3333