[rush] rush install hangs in docker build

[luoyu2015]

Summary

I meet a issue with rush in my CI flow, there is a step "node common/scripts/install-run-rush.js install" in my dockerfile, the ci build with the command docker build, and sometimes this step seems to run succcessfully with output of 'Rush install finished successfully. (33.91 seconds)', but after that it doesn't exit.
Is there something rush still do after rush install output 'rush install finished successfully. (33.91 seconds)' ?

Repro steps

Dockerfile

 FROM node:16.15.1-slim as builder

ARG CI_FE_DEBUG
ARG CI_COMMIT_SHA
ARG REPO_GIT_REMOTE_ADDRESS

WORKDIR /home/homework/
COPY . /home/homework/

RUN node common/scripts/install-run-rush.js --help
RUN node common/scripts/install-run-rush.js install

CI command:
docker build -t test .

Expected result:
the docker build finish after rush install

Actual result:
as in the docker top screenshot, the rush install doesn't exit and docker build hangs

Details

Standard questions

Please answer these questions to help us investigate your issue more quickly:

Question	Answer
@microsoft/rush globally installed version?	5.129.7
rushVersion from rush.json?	5.129.7
useWorkspaces from rush.json?	true
Operating system?	Linux
Would you consider contributing a PR?
Node.js version (node -v)?	v16.15.1