---> Using cache
 ---> d4b23e0bf641
Step 4/6 : RUN yarn add --registry=http://192.168.2.91:7001
 ---> Running in b712ba20d3f3
yarn add v1.6.0
error Missing list of packages to add to your project.
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.
The command '/bin/sh -c yarn add --registry=http://192.168.2.91:7001' returned a non-zero code: 1
ERROR: Job failed: exit status 1