create dockerfile for ECS tasks

[tiku-paystack]

Description

This Dockerfile pulls a magento2 docker image and sets it up

Motivation and Context

The Dockerfile would be used to startup an ECS container with magento2 and the paystack magento2 plugin running on it.

How Has This Been Tested?

The Dockerfile has been tested locally using docker-compose and used to run an ECS task.
Link to the deployed magento2 environment- https://plugin-alb-1949830085.eu-west-2.elb.amazonaws.com/

Acceptance Criteria

• The resulting ECS container should have the magento2 and Paystack magento2 plugin installed.

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My pull request addresses exactly one patch/feature.
• I have created a branch for this patch/feature.
• Each individual commit in the pull request is meaningful. (Please rebase, removing useless commits if not)
• I have added tests to cover my changes.
• All new and existing tests passed.
• My code follows the code style of this project.
• My change requires change(s) to the environment.
  
• My change requires change(s) to the database.
  
• Other information.

[gbade-paystack]

kindly edit the readme with how to run the plugin locally with Docker.

[gbade-paystack]

Did you give this magento image - https://hub.docker.com/r/bitnami/magento - a try before settling on the alexcheng one - https://hub.docker.com/r/alexcheng/magento2?

During our sync, I expressed why we had a preference for official images as against images from Dockerhub community users. The most important ones I stated were security and support in the form of updates and security fixes. The image that you are using here - alexcheng/magento2 - has not been updated for a year according to its' page on Dockerhub. So, how do we ensure that the image doesn't have any security holes or out-of-date software, and going forward, how do we get security fixes and updates for this image? Also, when we want to update, say to a new version of magento or update the Linux os underneath, how do we go about it?