Merge pull request aws#364 from awszhen/aws/20.06.15

Update Linux and ARM Dockerfiles

Merge pull request aws#350 from awszhen/aws/20.05.05

Add Linux standard images legal files

Merge pull request aws#316 from aws/20.03.13

Add new image versions: Standard 4.0, AL2 3.0

Merge pull request aws#275 from naga-aws/master

New image versions :: AL2 2.0 & Standard 3.0

Adding Android 29, Go 1.13 and other minor version updates

Adding support for AmazonLinux2 standard image available in CodeBuild…

…: /aws/codebuild/amazonlinux2-x86_64-standard:1.0

This image is available via the AWSCodeBuild console or the AWSCLI using the image name /aws/codebuild/amazonlinux2-x86_64-standard:1.0.

This image includes the runtime version switcher and requires runtime-versions to be
specified in the buildspec for more information look at our documentation:
https://docs.aws.amazon.com/codebuild/latest/userguide/sample-runtime-versions.html

Release updated Standard 2.0 image

Release updated Standard 2.0 image

Added new image: Standard 2.0 image with base Ubuntu 18.04

Added new image: Standard image with base Ubuntu 18.04