This PR amends the Dockerfiles and buildspec.yml files to enable dynamic resource prefixes when referring to (primarily) the appropriate ECR repository to use for the base image. This way, modifications can be made to the utils package and deployed to the particular user's development environment, and it will be referenced appropriately when building other application components (e.g., Admin, API) using it.
This PR amends the Dockerfiles and buildspec.yml files to enable dynamic resource prefixes when referring to (primarily) the appropriate ECR repository to use for the base image. This way, modifications can be made to the utils package and deployed to the particular user's development environment, and it will be referenced appropriately when building other application components (e.g., Admin, API) using it.