[HarshCasper]

The repo had no CI, and nothing checked that the demo works.

• New test.sh (make test) walks through the demo on a freshly started stack:
  • the create-polaris-catalog container exits 0, and the Polaris API returns the polaris catalog with base location s3://test-bucket/test
  • creates test-bucket, then runs script.sql statement by statement on LocalStack for Snowflake through snowflake-connector-python, and checks the final SELECT returns foobar and test
  • Trino returns the same rows from iceberg.test_namespace.iceberg_table
  • s3://test-bucket/test/ holds Parquet data files and Iceberg metadata.json files
• create-polaris-catalog.sh now checks HTTP status codes. Before, curl -i without --fail printed "Catalog created successfully" even when Polaris rejected the request. A 409 (catalog exists) is accepted, so the script can run again.
• make run ran the setup script on the host, where http://polaris:8181 does not resolve. It now runs the compose service. make check looks for the AWS CLI instead of lstk, which the demo does not use.
• docker-compose.yml required LOCALSTACK_AUTH_TOKEN for every compose command, so make stop, make logs and docker compose exec failed unless the token was exported. It now defaults to empty, and make start still checks that it is set.
• README: test instructions, the catalog setup that make start already runs, docker compose instead of docker-compose, and the LocalStack health URL.
• New workflow: starts the stack with make start, runs make test, prints container logs on failure.

Verified by CI.

https://claude.ai/code/session_01DZfDmzUBPqNAu3yFKyfCNM