Adds a production ready docker environment

[microstudi]

This PR optimizes the application for its use in Docker images:

• [x] Unifies development/production webserver by using Puma. Makes it configurable in terms of multithreading/multiprocessing.
• [x] Removes capistrano related files
• [x] Tests the docker build process in an action
• [x] Enables and documents (see README) ENV vars for the application
• [x] Provides a docker-compose.yml production testing file (not for real use)
• [x] Optimizes a two-step Docker image. Removes the necessity of a JS runtime after a precomilation of assets
• [x] Uses a supervisor that allows to run Sidekiq/Rails on the same Docker image (this can be configured with ENV vars)
• [x] Lints ruby files with rubocop
• [x] Fixes the use of ImageMagik in Rails 7

Testing

Run

docker compose up

Visit http:/localhost:3000/

Env vars summary:

ENV	Description	Default
RAILS_ENV	Define the rails environment (not necessary to setup unless you have some special requirements)	production
SECRET_KEY_BASE	Secret key for the application, generate a new one with the command rails secret
DATABASE_URL	Database URL, the format is postgresql://user:password@host:port/database
RAILS_SERVE_STATIC_FILES	Tell the application to serve static files (you might want to turn this off if you are using an external web server to serve files from the public folder)	true
RAILS_LOG_TO_STDOUT	Tell the application to log to STDOUT (useful for Docker)	true
RAILS_LOG_LEVEL	Log level for the application (use debug for maximum information)	info
RAILS_MAX_THREADS	Maximum number of threads to use in the application (use 1 if multithreading is not desired)	5
RAILS_MIN_THREADS	Minimum number of threads to use in the application	RAILS_MAX_THREADS value
WEB_CONCURRENCY	Number of web server processes to use	2
RUN_SIDEKIQ	Run Sidekiq worker process in the docker instance (you might want to change this if want to run different docker instances for Sidekiq and Rails)	true
RUN_RAILS	Run Rails web server process in the docker instance	true
QUEUE_ADAPTER	Adapter to use for background jobs (currently the application is using exclusively Sidekiq, so no other options here right now)	sidekiq
SIDEKIQ_CONCURRENCY	Number of threads to use in Sidekiq	5
STORAGE_PROVIDER	Storage provider for the application (currently the application supports local and amazon)	local
FORCE_SSL	Force SSL connections	false
MAIL_LINK_HOST	Host to use in the links sent by email (use your domain without protocol mydomain.tld)
MAIL_LINK_PROTOCOL	Protocol to use in the previous host defined for links sent by email	https
SMTP_ADDRESS	SMTP server address (ie: smtp.mailgun.org)
SMTP_PORT	SMTP server port (ie: 587)
SMTP_DOMAIN	SMTP domain (usually the application's domain)
SMTP_USER_NAME	SMTP username
SMTP_PASSWORD	SMTP password
SMTP_AUTHENTICATION	SMTP authentication method	plain
SMTP_ENABLE_STARTTLS_AUTO	Enable STARTTLS	true
SMTP_OPENSSL_VERIFY_MODE	OpenSSL verify mode	none
AWS_ACCESS_KEY_ID	AWS access key ID (only if STORAGE_PROVIDER is amazon)
AWS_SECRET_ACCESS_KEY	AWS secret access key (only if STORAGE_PROVIDER is amazon)
AWS_BUCKET	AWS bucket name (only if STORAGE_PROVIDER is amazon)
AWS_REGION	AWS region (only if STORAGE_PROVIDER is amazon)
ADMINS	Space separated list of emails for the superadmins (ie: admin@timeoverflow.org

[markets]

@microstudi I added some small comments 🙏🏼 and I see there is also 1 failing test: https://github.com/coopdevs/timeoverflow/actions/runs/7800180296/job/21272472836?pr=730#step:5:25. The rest seems good to me 👌🏼.

[microstudi]

@markets the failing test is due the update of the imagemagik library. I've fixed it but something happened with the upload coverage. The rest is applied!