Add Dockerfile for birdwatcher (#100)

Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>

Author: congqixia

Dockerfile

@@ -0,0 +1,13 @@
+From golang:1.18-buster as build
+
+WORKDIR /birdwatcher
+COPY . .
+
+WORKDIR /birdwatcher
+RUN apt update && apt install gcc
+RUN GOPROXY="https://goproxy.cn,direct" go build -o /birdwatcher/bin/birdwatcher -tags WKAFKA main.go
+
+FROM debian:buster 
+COPY --from=build /birdwatcher/bin/birdwatcher /birdwatcher/birdwatcher
+
+CMD ["sleep", "infinity"]