Fix Element Alpha workflow

[pixlwave]

set-output is deprecated and the generated warning fails the secret check.
This change matches the workflow used on ElementX which compares the PR's repo to make sure it matches the workflow's repo.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Base: 11.83% // Head: 11.82% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (7843adb) compared to base (fb046b2).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7256      +/-   ##
===========================================
- Coverage    11.83%   11.82%   -0.01%     
===========================================
  Files         1630     1630              
  Lines       160349   160373      +24     
  Branches     65502    65513      +11     
===========================================
  Hits         18970    18970              
- Misses      140740   140764      +24     
  Partials       639      639              

Flag	Coverage Δ
unittests	5.96% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Riot/Modules/Room/RoomViewController.m	0.00% <0.00%> (ø)
...r/Coordinator/VoiceBroadcastRecorderProvider.swift	0.00% <0.00%> (ø)
...oordinator/VoiceBroadcastRecorderCoordinator.swift	0.00% <0.00%> (ø)
...vice/MatrixSDK/VoiceBroadcastRecorderService.swift	0.00% <0.00%> (ø)

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[github-actions]

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[phloux]

LGTM