Additional Containers: Add Script configuration option

[rraub]

Description

for the additional_containers section, it would be useful to be able to specify a script to run just like the top level tasks. Some off the shelf containers like postgres don't support configurations via environment variables.

Context

Example

  container:
    image: mytestimage:latest
    additional_containers:
      - name: postgres
        image: postgres:11.5-alpine
        cpu: 1
        memory: 2G
        port: 5432
        env:
          POSTGRES_USER: user
          POSTGRES_PASSWORD: password
          POSTGRES_DB: databasename
        script:
          - postgres -c 'shared_buffers=512MB' -c 'max_connections=200' -c 'autovacuum=false'

Anything Else

Additionally if there was a way to get at logs for these additional containers that could be helpful.

[fkorotkov]

You can override the default command via command field instead of script and for the logs part there is #140.