[codex] Add edge push deploy workflow

[seslly]

Summary

Adds an app-owned GitHub Actions deploy path for the Shipstuff DigitalOcean edge.

Changes:

• validates/builds the app on pull requests
• uploads static assets or backend release artifacts with shipstuff/actions/digital-ocean-upload
• uses the production environment EDGE_KEY secret that the servertimeai operator playbook creates

Validation

• workflow YAML parsed locally
• repo-specific smoke/build checks were run where practical before opening this PR

Note: production deploy remains blocked until the matching servertimeai operator playbook has been run for this service.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Point the deploy workflow at main

In this checkout the integration branch is main (git branch --all shows no master branch), but this trigger only runs for pushes to master; the deploy job also repeats refs/heads/master. If merges land on main, the new push validation and edge deploy path will not run at all for this repo, so production deploys remain silently disabled.

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