Uploading nightly APK with released signature.

[MohitMaliFtechiz]

Fixes #3838

• Uploading nightly APK with a released signature so that APK can update, if a user downloads the new version of nightly like our released APK.
• Modified the nightly CI for this change.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.85%. Comparing base (4256247) to head (ed0ffad).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3844      +/-   ##
============================================
+ Coverage     53.77%   53.85%   +0.08%     
- Complexity     1320     1324       +4     
============================================
  Files           292      292              
  Lines         11078    11078              
  Branches       1471     1471              
============================================
+ Hits           5957     5966       +9     
+ Misses         4134     4130       -4     
+ Partials        987      982       -5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.