make deployment container-ready

Dockerfile

@@ -0,0 +1,10 @@
+FROM golang:alpine AS builder
+WORKDIR /build
+ADD go.mod .
+COPY . .
+RUN go build 
+FROM alpine
+WORKDIR /build
+COPY --from=builder /build/wo-bisch-lorahandler /build/wo-bisch-lorahandler
+CMD ["./wo-bisch-lorahandler"]
+EXPOSE 8080