Changes the **Build and push prepared templates** workflow to run only
on manual trigger (`workflow_dispatch`) instead of automatically on
every push to `main` touching `templates/**`.
This prevents the base template from being rebuilt and republished to
DockerHub/E2B on every change, giving control over when builds happen.
Once merged to `main`, the workflow can be triggered from the Actions UI
("Run workflow") or via `gh workflow run templates.yml`.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Mish Ushakov
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