Add user node-red to dialout group

[fightforlife]

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Proposed changes

This is needed for the Serialport-Node to work properly.
At the moment I do it manually after each update. But I think it would be very convinient for a lot of users to have this baked in. Since the serialport node belongs to the standard nodes of nodered and should work out of the box. New users should be able to directly talk to their serial devices by just adding them to the container with the devies parameter.

See this Issue: #15

I have created a fork and pushed it to the docker hub with just this small change:
https://hub.docker.com/r/fred92/nodered

I tested it successfully with my docker compose file:

version: "2"
services:
  nodered:
    image: fred92/nodered:latest (with useradd dialout)
    #image: nodered/node-red-docker:latest (official, without)
    ports:
      - "9004:1880/tcp"
    restart: always
    volumes:
      - nodered_config:/data
    devices:
      - "/dev/ttyUSB-433:/dev/ttyUSB-433"

Checklist

• I have read the contribution guidelines
• For non-bugfix PRs, I have discussed this change on the mailing list/slack team.
• I have run grunt to verify the unit tests pass
• I have added suitable unit tests to cover the new/changed functionality

[fightforlife]

Any answer to this?

[fightforlife]

Can be closed.

Found an easier way using docker compose:

group_add: - dialout