ci: initial CI & CD

[Herve-M]

Basic CI/CD pipeline for BG3ModManager.

Goal/Idea: streamline the release of BG3ModManager

Workflow:

• Creating a PR or pushing to master: will make a build, validating or not the changes
• Creating a tag or release: will make a build and create or update release with 2 artifacts (release and debug)

Setup:

• Require https://github.com/LaughingLeader/lslib/pull/1
• Require 2 Actions variables as (how-to):
  • LSLIB_GITHUB: LaughingLeader/lslib
  • LSLIB_VERSION: v1.18.5.0 (or any tag)

Demo:

• Build: https://github.com/Herve-M/BG3ModManager/actions/runs/7328205442
• PR validation: https://github.com/Herve-M/BG3ModManager/pull/1
• Release: https://github.com/Herve-M/BG3ModManager/releases/tag/v1.0.10.0