feat: add a default Dockerfile (#48)

Author: aleksraiden

Dockerfile

@@ -0,0 +1,26 @@
+FROM golang:1.23-alpine3.21 AS build
+
+ARG TARGETARCH=amd64
+ENV GOARCH=${TARGETARCH}
+
+WORKDIR /opt
+
+COPY . .
+
+RUN go build . 
+
+FROM alpine:3.21
+
+RUN apk update && apk upgrade && apk add --no-cache curl
+
+WORKDIR /opt
+
+COPY --from=build /opt/kvrocks_exporter kvrocks_exporter
+
+COPY --from=build /opt/LICENSE .
+
+EXPOSE 9121/tcp
+
+HEALTHCHECK --interval=30s --timeout=1s --start-period=5s --retries=3 CMD curl --fail -s http://localhost:9121/health | grep 'ok' || exit 1
+
+ENTRYPOINT [ "/kvrocks_exporter" ]