Update S3 buckets and ECR for migration

- Use S3 bucket in Arm infrastrcture
- As there are multiple environments such as (DEV, TEST, PROD)
suffix bucket with INRA_ENV name.
- Use system variable for ECR repository

Change-Id: Id75bb5a49305a7abc059741f8bcb4e60595fbf1a
Signed-off-by: Saheer Babu <saheer.babu@arm.com>
6 files changed