Port Docker Compose examples

[chaptersix]

What was changed

• Ported Docker Compose examples from temporalio/docker-compose into new compose/ directory
• Modified setup scripts to work with Temporal server versions before and after 1.30
  • Added fallback from temporal-elasticsearch-tool (1.30+) to curl for ES/OpenSearch setup
  • Improved ES/OpenSearch readiness checks to wait for cluster health, not just port availability
• Added CI workflow to test all compose configurations
• Added validation container that verifies cluster health, namespace access, and workflow execution
• Removed deprecated version tags from compose files

Why?

• Consolidates Docker Compose examples into this repo
• Ensures compatibility across Temporal server versions (pre and post 1.30)
• CI ensures compose examples stay functional across changes

[robholland]

lgtm.