fix: simplify bundletool keystore creation in download-signed-apk

[graycreate]

Summary

• Simplify the bundletool keystore creation logic in the download-signed-apk job
• Remove complex fallback logic that was causing failures with exit code 8

Issue

The download-signed-apk job was failing because of overly complex keystore creation logic with fallback error handling. The keytool command was being redirected to /dev/null making debugging difficult.

Fix

• Create debug keystore upfront using a simple keytool command
• Remove the complex try/catch logic with fallback
• Use consistent keystore filename (debug.keystore)

Test plan

• Workflow syntax validation
• Test with v2.3.3 release to verify bundletool works correctly
• Verify Google Play signed APK is generated and uploaded to release

🤖 Generated with Claude Code

[Copilot]

Pull Request Overview

Simplifies the bundletool keystore creation logic in the download-signed-apk job by removing complex fallback error handling that was causing failures. The fix creates a debug keystore upfront with a straightforward approach instead of using a try/catch pattern with output redirection.

• Remove complex fallback logic with error handling that was causing exit code 8 failures
• Create debug keystore upfront using a simple keytool command without output redirection
• Use consistent keystore filename (debug.keystore instead of dummy.keystore)

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