Add mounts for docker-compose-dev-services

[cmltaWt0]

This PR is adding the ability to do a local development for credentials.

I am trying to use the plugin for local development but the process of adding mounts doesn't work for me.
Am I missing something or mounts should be considered in local-docker-compose-dev-services?

--

How to test:

cat ./root/env/dev/docker-compose.yml
...
  credentials:
    environment:
      DJANGO_SETTINGS_MODULE: credentials.settings.tutor.development
    command: ./manage.py runserver 0.0.0.0:8150
    ports:
      - "127.0.0.1:8150:8150"
    stdin_open: true
    tty: true
    volumes:
      # editable requirements
      - ../plugins/credentials/build/credentials/requirements:/openedx/requirements
    networks:
      default:
        aliases:
          - "credentials.local.edly.io"
...

tutor mounts add ./src/credentials

cat ./root/env/dev/docker-compose.yml
...
  credentials:
    environment:
      DJANGO_SETTINGS_MODULE: credentials.settings.tutor.development
    command: ./manage.py runserver 0.0.0.0:8150
    ports:
      - "127.0.0.1:8150:8150"
    stdin_open: true
    tty: true
    volumes:
      # editable requirements
      - ../plugins/credentials/build/credentials/requirements:/openedx/requirements
      - /Users/cmltawt0/code/boxes/nightly/src/credentials:/openedx/credentials
    networks:
      default:
        aliases:
          - "credentials.local.edly.io"
...

The same effect we can achieve by manually removing our mount from ./root/env/dev/docker-compose.yml and then invoking config save command:

tutor config save

cat ./root/env/dev/docker-compose.yml
...
  credentials:
    environment:
      DJANGO_SETTINGS_MODULE: credentials.settings.tutor.development
    command: ./manage.py runserver 0.0.0.0:8150
    ports:
      - "127.0.0.1:8150:8150"
    stdin_open: true
    tty: true
    volumes:
      # editable requirements
      - ../plugins/credentials/build/credentials/requirements:/openedx/requirements
      - /Users/cmltawt0/code/boxes/nightly/src/credentials:/openedx/credentials
    networks:
      default:
        aliases:
          - "credentials.local.edly.io"
...

---

I'll test against master branch and post command to make it works with all console output.
Then change the DRAFT status to ready.

[regisb]

In principle, this is a great new feature! Please add some docs about it to the README. Also, please add a changelog entry https://docs.tutor.overhang.io/tutor.html#contributing

[regisb]

@Faraz32123 what's the status of this PR?
@cmltaWt0 can you please add a changelog entry? https://docs.tutor.overhang.io/tutor.html#contributing

[Faraz32123]

@Faraz32123 what's the status of this PR? @cmltaWt0 can you please add a changelog entry? https://docs.tutor.overhang.io/tutor.html#contributing

@cmltaWt0 was going to test it and then change the name from DRAFT.
It is not ready for review according to this comment

[cmltaWt0]

@regisb @Faraz32123
Sorry for such delay - lack of time.
I'm going to add a changelog entry and switch the target branch to master.
PR is still in draft.

[cmltaWt0]

@regisb @Faraz32123 I've added the changelog, switched the target branch to master.
The PR can be tested now.

[Faraz32123]

LGTM!