System Bucket should come from environment variable

[jpswinski]

The system bucket is parameterizEd throughout the cloud formation code to support project migration, but it is hardcoded in the SystemConfig systemBucket definition. This defeats the ability to move projects without changing and rebuilding the code.

The System Bucket should be passed in as an environment variable (or lua parameter in config.json), and supplied in the Makefile and Docker Compose files.

[jpswinski]

Same is true for the containerRegistry definition.