Add GitHub Actions workflow for production Android APK builds

[jpdevhub]

This PR introduces automated GitHub Actions for building our Android application and updates the EAS configuration to output an APK format instead of an AAB for production builds.

Summary by CodeRabbit

Release Notes

• Chores
  • Established automated production build pipeline for Android releases, triggering deployments on updates to the main branch.

[coderabbitai]

Note

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 0f3c77d3-0a38-47f5-9b1a-a82d5b19125f

📥 Commits

Reviewing files that changed from the base of the PR and between fb88049 and efed79b.

📒 Files selected for processing (2)

• .github/workflows/deploy.yml
• apps/mobile/eas.json

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch expo-config

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