Adding support for aws cli v2

[clayrosenthal]

Adding support for awscliv2, toggled by env var AWS_CLI being set to v2 or 2

Taking a crack, as #31 is stale.

Testing:

$ docker run --rm  -it localhost/alpine/k8s:1.31.6 aws --version             
aws-cli/1.37.25 Python/3.12.9 Linux/6.11.3-200.fc40.aarch64 botocore/1.36.25
$ docker run --rm -e AWS_CLI=v1 localhost/alpine/k8s:1.31.6 aws --version
aws-cli/1.37.25 Python/3.12.9 Linux/6.11.3-200.fc40.aarch64 botocore/1.36.25
$ docker run --rm -e AWS_CLI=v2 -it localhost/alpine/k8s:1.31.6 aws --version
aws-cli/2.22.10 Python/3.12.9 Linux/6.11.3-200.fc40.aarch64 source/aarch64.alpine.3