Draft: A better docker config for decidim

[froger]

This PR is a draft. Don't merge. Description will be updated along time.

[froger]

Update on this PR:

DONE

• [x] Update script to sync the repo. This is a manual execution for now.
• [x] Better README
• [x] Working supervisord configuration to run puma and sidekiq in the same env.
• [x] Entrypoint that seed the database with a System::Admin if none exists.

TODOS

• [ ] Github pipelines: I need help on this, as I've never worked on github pipelines (only gitlab).
• [ ] Add a development/test image. This will come ASAP, to publish a development/test image per version.
• [ ] Test the dockerfiles for 0.27-stable, 0.26-stable and the current dev.
• [ ] Add a default crontab configuration to manage cron in a easy way.
• [ ] Make an issue in decidim-generators to enable --queue sidekiq on 0.26, don't add secrets, and be able to configure SMTP_PORT and SMTP_AUTHENTICATION with env.

[alecslupu]

@froger , i have looked through the Docker file you are proposing, and i see some things that i would do a bit differently:

1. Crontab : I would use the whenever gem with a local installed schedule.rb file, that would allow me to customize what to run, when to run, or even add my own tasks
2. Prod rails initializer should be provided with cache options ...
3. I would add all the Env Variables with their defaults to the quickstart.yml ..

[alecslupu]

@froger , i have looked through the Docker file you are proposing, and i see some things that i would do a bit differently:

1. Crontab : I would use the whenever gem with a local installed schedule.rb file, that would allow me to customize what to run, when to run, or even add my own tasks

2. Prod rails initializer should be provided with cache options ...

3. I would add all the Env Variables with their defaults to the quickstart.yml ..

Also:

• I see the config folder is being added only for decidim 0.26 ... how should be handle 0.27 ? or develop ?
• Can we have a RAILS_ENV=test image as well?