Add support for Docker runtime 20

[Andykmcc]

Describe the bug
When trying to use docker version 20 to build an image with amazon linux 2 it fails with the error Phase context status code: YAML_FILE_ERROR Message: Unknown runtime version named '20' of docker. This build image has the following versions: 18, 19. Is adding support for docker 20 on a roadmap? If so, what is the expected timeframe for support?

To Reproduce
Steps to reproduce the behavior:

1. Make a new buildspec.
2. include the following phase

phases:
  install:
    runtime-versions:
      docker: 20
...

Expected behavior
The build should succeed using docker 20

Logs
Phase context status code: YAML_FILE_ERROR Message: Unknown runtime version named '20' of docker. This build image has the following versions: 18, 19

Platform (please complete the following information):

• aws/codebuild/amazonlinux2-x86_64-standard:3.0

[subinataws]

Addressed in https://github.com/aws/aws-codebuild-docker-images/releases/tag/22.06.30

[rahulpatil118]

[rahulpatil118]

you have to enable privileged for this to run docker