Build release in Dockerfile about workbench HOT 3 OPEN

I have put this on pause but I have pushed and opened a PR it's WIP, I have some issues with the JS assets.

#169

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Heyo @steffenix 👋

The current docker + compose setup is targeted at development but I think it's a good call to have a prod one also and use mix release. Do you mind creating a PR?

What's your thoughts on:

• Rename the current Dockerfile to Dockerfile.dev
• Create a new Dockerfile the builds the app with mix release
• Use Dockerfile.dev in the build context of docker-compose.override.yml
• Use Dockerfile in the base docker-compose.yml

from workbench.

@steffenix I made some improvements to the docker setup in e5894cd

The second layer could now build using mix release

from workbench.