add dockerfile

Dockerfile

@@ -0,0 +1,23 @@
+FROM golang:latest AS build-env
+WORKDIR /src
+ENV CGO_ENABLED=0
+COPY go.mod /src/
+RUN go mod download
+COPY . .
+RUN  go build -a -o stunner -ldflags="-s -w" -gcflags="all=-trimpath=/src" -asmflags="all=-trimpath=/src"
+
+FROM alpine:latest
+
+RUN apk add --no-cache ca-certificates \
+    && rm -rf /var/cache/*
+
+RUN mkdir -p /app \
+    && adduser -D stunner \
+    && chown -R stunner:stunner /app
+
+USER stunner
+WORKDIR /app
+
+COPY --from=build-env /src/stunner .
+
+ENTRYPOINT [ "./stunner" ]