Aws-codebuild-docker-images: Support privileged build containers

[jrowen]

It would be a useful enhancement to add a flag to codebuild_build.sh that supports running the build container as --privileged.

[subinataws]

@jrowen - how is this helpful? Can you provide more context?

CodeBuild local already have Docker access, without needing a --privileged flag. Trying to understand what use case would a "--privileged" flag on the local version enable.

[jrowen]

I found this flag was needed if my build was using something like s3fs-fuse.

[canada4663]

Or mounting image blobs - i.e. need for losetup and mknod

[3p3r]

@subinataws --privileged allows us to access kernel modules inside build containers. I wanted to use local CodeBuild within a Custom CodePipeline Action to run builds that require custom AMIs with custom kernel modules. Unfortunately local CodeBuild does not allow that currently without the --privileged flag passed to build containers.

[subinataws]

Support added in https://github.com/aws/aws-codebuild-docker-images/pull/336. Thanks @awszhen