update Dockerfile

Dockerfile

@@ -13,4 +13,8 @@ RUN apk add --no-cache ca-certificates
 
 COPY --from=build /go/src/github.com/yumc.pw/cloud/cloud ./main
 
-CMD ["./main"]
+ENV SOURCE=yumc.pw
+ENV TARGET=https://git.yumc.pw
+ENV PROTOCOL=git
+
+CMD ["./main", "-s", "${SOURCE}", "-t", "${TARGET}", "-p", "${PROTOCOL}"]