Container build hanging

20:19:50 $ cross-env NODE_ENV=production yarn run bundle:dev

20:19:51 $ yarn run linter && yarn run webpacker

20:19:52 $ yarn eslint --no-eslintrc -c .eslintrc.js --ext .js --ext .jsx .

20:19:52 $ /pgadmin4/web/node_modules/.bin/eslint --no-eslintrc -c .eslintrc.js --ext .js --ext .jsx .

Both systems (a Jenkins build node and my laptop) hang at that step, seemingly indefinitely.

Running the same (e.g. yarn eslint --no-eslintrc -c .eslintrc.js --ext .js --ext .jsx .) is fine directly on my laptop. 

Anyone got any ideas why that may be? The only thing I can think of is the overly cute unicode symbols that yarn is spitting out may be confusing docker.