node --inspect (from docs) debugging not working

Running `node_modules/.bin/ember s` and FastBoot app works fine:

```
ember_1 | Build successful (15195ms) – Serving on http://localhost:4200/
```

Running `node --inspect=0.0.0.0:9230 node_modules/.bin/ember s` [as seen in the docs](https://github.com/ember-fastboot/ember-cli-fastboot#developer-tools) crashes the build:

```
ember_1 | Debugger listening on ws://0.0.0.0:9230/4cadad1e-33a2-43aa-8176-e78f2ba369c3
ember_1 | For help see https://nodejs.org/en/docs/inspector
ember_1 | Debugger attached.
ember_1 | Debugger listening on ws://127.0.0.1:43210/88de5521-81b9-41dc-be17-0e8c51d72db2
ember_1 | For help see https://nodejs.org/en/docs/inspector
ember_1 | Debugger listening on ws://127.0.0.1:43211/9866cbf3-fda7-49c4-ba29-5b697bb12e6f
ember_1 | For help see https://nodejs.org/en/docs/inspector
ember_1 | Debugger listening on ws://127.0.0.1:43212/8f347f60-5b04-49e1-8658-d766960ccbea
ember_1 | For help see https://nodejs.org/en/docs/inspector
ember_1 | Starting inspector on 127.0.0.1:43210 failed: address already in use
ember_1 | Starting inspector on 127.0.0.1:43211 failed: address already in use
ember_1 | Starting inspector on 127.0.0.1:43212 failed: address already in use
ember_1 | Build Error (broccoli-persistent-filter:Babel > [Babel: ember-cli-fastboot]) in ember-cli-fastboot/instance-initializers/clear-double-boot.js
ember_1 |
ember_1 | Worker terminated unexpectedly
ember_1 |
ember_1 |
ember_1 | Stack Trace and Error Report: /tmp/error.dump.43b2d349c51e3d5ce601186b35d5e8ec.log
```

The crash keeps removing the files (because dockerized app) but if the error dump is really really important and the above log is not enough in terms of hints for more knowledgable people, I can add volumes so I can attach this dump. But it looks like the app is spinning (debugger keeps trying to attach) and then it crashes unexpectedly.