fix cli dockerfile as wel

Author: GavinZZ

packages/@aws-cdk-testing/cli-integ/resources/cdk-apps/sam_cdk_integ_app/src/docker/DockerImageFunctionConstruct/Dockerfile

@@ -5,5 +5,7 @@ COPY app.js  package.json ./
 
 RUN npm install
 
+USER nobody
+
 # Set the CMD to your handler (could also be done as a parameter override outside of the Dockerfile)
 CMD [ "app.lambdaHandler" ]