Docker based setup script/cloud images

[arikfr]

Following #896, it's time to update our setup script to use 🐳 Docker based deployment. This has many benefits among them easier and more stable upgrades (always using updated dependencies) and more standard setup across different platforms.

New setup script

Once we move to use Docker, the setup script will do:

• Install Docker & Docker Compose.
• Download docker-compose.yml file and other supporting files.
• Start services.
• Done.

New upgrade script

The upgrade script will probably be something along the lines of:

• Get latest version Docker image tag reference.
• Update docker-compose.yml.
• Rebuild services.
• Stop services.
• Apply migrations if needed.
• Start services.

Documentation

Will have to update documentation accordingly. Mainly:

• Setup guide (source)
• How to upgrade (source)
• On going maintenance (source)

Control script

While controlling, checking logs, etc, can be done with the docker-compose command we should consider streamlining the process with a single control script.

I'm not 100% sure this is needed, but it can improve end user (admin) experience. On the otherhand, it makes the knowledge less portable.

---

This is an outline of the work required and some initial thoughts. Any feedback is welcome. Specially from users who already use Docker/Docker Compose for their Redash deployment.

[lkraider]

The basic upgrade workflow I have been using is:

1. Edit docker-compose.production.yml and point to specific tag you want to deploy:

-    image: redash/redash:latest
+    image: redash/redash:4.0.0-rc.1

2. Pull the same tagged image:

docker pull redash/redash:4.0.0-rc.1

3. Redeploy the service:

docker-compose -f docker-compose.production.yml -p redash up -d

4. Run migrations
   Still no clue how to do that correctly, assuming this suffices:

docker exec -ti redash_server_1 ./manage.py db upgrade