Support building templates manually

[djeebus]

No description provided.

[cursor]

PR Summary

Medium Risk
Adds a manually triggered deployment workflow that runs with environment-scoped secrets and can reuse build cache; misconfiguration could deploy to the wrong environment or produce stale builds when cache is enabled.

Overview
Adds a manual GitHub Actions workflow to build and deploy the E2B base template to a selected environment, with an input to optionally enable the build cache; the build script now reads USE_CACHE to toggle skipCache and logs whether caching is enabled.

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[chatgpt-codex-connector]

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

There are 3 total unresolved issues (including 2 from previous reviews).

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