[FEAT] An action that builds a fpm and cli docker image

[damienwebdev]

💡 Feature request

Feature Name

• docker-build

The Desired Behavior

Build a Magento codebase for docker onto a fpm and cli image. There's documentation of this here: https://docs.mappia.io/containerizing.html

Your Use Case

• As a developer, I would like to have a pre-built action that attempts to build a docker image of a Magento store.
• I would like lower the barrier to entry to Docker + Magento as well as improve the on-ramp to https://www.mappia.io/

[damienwebdev]

Closing in favor of mage-os/github-actions#16