Ember CLI build killed

I build my Ember CLI app inside a docker container on startup. The build fails without an error message, it just says killed:

root@fstaging:/frontend/source# node_modules/ember-cli/bin/ember build -prod                   
version: 1.13.15
Could not find watchman, falling back to NodeWatcher for file system events.
Visit http://ift.tt/1PK1A1H for more info.
Buildingember-auto-register-helpers is not required for Ember 2.0.0 and later please remove from your `package.json`.
Building.DEPRECATION: The `bind-attr` helper ('app/templates/components/file-selector.hbs' @ L1:C7) is deprecated in favor of HTMLBars-style bound attributes.
        at isBindAttrModifier (/app/source/bower_components/ember/ember-template-compiler.js:11751:34)
Killed

The same docker image successfully starts up in another environment, but without hardware constraints. Does Ember CLI have hard-coded hardware constraints for the build process? The RAM is limited to 128m and swap to 2g.