Consider moving images to quay.io

[cdcabrera]

Feature description

As a maintainer we need to consider the future rate limiting being imposed by Docker and consider alternatives, quay.io.

202108 Update
A new incentive is Docker's webhooks have been disable on purpose along with pricing tiers... filling out a sketchy google form to claim we're open source feels ... odd, the path of least resistance appears as - move over to Quay

Is your feature request related to a problem?

Potential rate limits on images. However, because we're a smaller project this potentially has zero consequences staying the course.

Describe the solution you'd like

A path for moving to quay.io in all its potential complicated glory!

Acceptance Criteria

• Determine the level of effort to make the jump to quay.io
  • Move to quay or not...
  • Update README to reflect Quay.io move

[cdcabrera]

As of 20210820

• you can run $ docker pull quay.io/cdcabrera/apidoc-mock to pull the latest updates. appears we may have to manually trigger the tags, for now we'll hold
• and for general viewing, https://quay.io/repository/cdcabrera/apidoc-mock

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