Kafka topics management

[iyourshaw]

Updates the kafka-setup service to use the jikkou resource-as-code framework to create Kafka topics.

The kafka-setup service can now be configured with the environment variables described in the updated README to create groups of topics for the ODE applications: jpo-ode, jpo-geojsonconverter, jpo-conflictmonitor, and jpo-deduplicator.

New/updated files in the /kafka folder:

• kafka-topics-values.yaml - Configuration file containing topics for all applications
• kafka-topics-template.jinja - A template to create resource definitions for the topics.
• application.conf, jikkouconfig - Jikkou configuration files
• kafka_init.sh - Initialization script that runs the Jikkou CLI to validate the resource definitions and create topics
• Dockerfile.jikkou - Runs the init script in a container.

This PR also adds a health check to the kafka service in docker-compose-kafka.yml, and adds dependencies to the other containers in that compose so that they wait for Kafka to fully start up before running.

Tested by running Docker Compose with the kafka_full profile, and observing the topics created in the Kafka UI.

Future Development

Worth looking into for future updates:

• Jikkou also has the ability to manage Kafka Connect and Schema Registry and to be run as a long-running API service. For example it could simplify creating connectors, and monitor their health and restart them as needed.
• Could look into integrating the Jikkou tool into a Kubernetes init container and/or Gihub Actions for use in production.

[Michael7371]

Overall looks good, just one comment.