Automatically publish GitHub pre-releases based on develop branch

[ViMaSter]

Summary

Currently, only logged-in GitHub users can download the latest builds. Developers must create GitHub Releases by hand, to make builds available for other users.

This change updates the build pipeline to automatically create GitHub Pre-Releases when pushing code to develop (hence whenever a developer integrates a Pull Request, GitHub provides a new Pre-Release).

Testing instructions

Not really possible. The updated code is only run when develop is updated. Integrate and pray? 👀

Additional information

• [ ] Changes UI
• [ ] Introduces new feature
• [ ] Removes existing feature
• [x] Has associated resource:
  • closes Automatically create pre-release versions of the game whenever develop is updated #467

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.38%. Comparing base (e273d8c) to head (3d87b9c).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #476   +/-   ##
========================================
  Coverage    81.38%   81.38%           
========================================
  Files           91       91           
  Lines         3046     3046           
========================================
  Hits          2479     2479           
  Misses         567      567           

Flag	Coverage Δ
EditModeTests_Suites_Core	15.75% <ø> (ø)
EditModeTests_Suites_TextDecoder	16.57% <ø> (ø)
PlayModeTests_Suites_Playthrough	60.01% <ø> (ø)
PlayModeTests_Suites_Scenes	58.01% <ø> (ø)
PlayModeTests_Suites_Scripts	62.77% <ø> (ø)

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[lyndsiWilliams]

Integrate and pray 🙏