chore: update demo deploy cadence to be on tag (instead of main)

[brendan-kellam]

Updates the demo deploy cadence to be on tag instead of main. The reasoning is that I would like to make breaking REST API changes (like in #555) without having to spin a new release. However, MCP depends on the demo instance's REST api not breaking (on non-version changes), so that complicates things.

Whether we should worry about breaking public MCP is a separate discussion. For now, let's avoid breaking it.

[github-actions]

@brendan-kellam your pull request is missing a changelog!

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bkellam/demo_deploy_cadence

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