Add CI tests

[C0rn3j]

• Compile translations
• Update translations - Probably as simple as running them and checking that only messages.pots got an edited timestamp and nothing else needs updates?
• Linux installation - pyinstaller builds for macOS and Linux in the CI #1348
• macOS installation - pyinstaller builds for macOS and Linux in the CI #1348
• Windows (MINGW64) installation - Add Windows CI and fix up Linux and macOS #1354
• Flatpak installation - Flatpak CI #1365
• Portable (venv) Linux run - Maybe as a git hook since running a GUI app in the CI in any capacity might turn out to be night impossible or require reworking inside of Tauon to support GUI-less tests. Maybe looking up how to mock SDL might work.
• Non-portable Linux run - Portable does not necessarily hit all the code paths, this might need
• DB migrations - We have no idea if someone with DB v1 can actually upgrade all the way to latest DB schema
• LSP - check that the types check out - currently somewhat impossible due to the large size that t_main.py has, and at least Pyright/Jedi seem to time out on it - can maybe be overwritten
• Linter - least important and the most annoying

---

TODO:

Nice to have:

• Make sure we're not dupe-packing assets, theme and templates - they could theoretically be packed in the executable.
• picard is commented out - 2.12.3 is broken - we're waiting on a new release - they said probably January https://github.com/metabrainz/picard/releases
• We install/suggest SDL2 deps but we use pysdl2-dll now so they should not be required
• Windows pysdl2-dll broke somehow (did it actually work before...)
• We're packing entire pysdl2-dll instead of just the two modules we need - how much filesize is it that we could save, does it matter?
• Linux: pyinstaller won't run on Arch Linux after 3.13 Python update - https://github.com/orgs/pyinstaller/discussions/8945 + hookutils: setuptools: fix errors with de-vendored setuptools pyinstaller/pyinstaller#8947
• macOS: Builds randomly fail due to hdiutil failures when creating DMGs on macOS 13 runner actions/runner-images#7522 (comment) for example https://github.com/C0rn3j/Tauon/actions/runs/12449363589/job/34754888207
• Windows: The CI is SLOW, we should try sharing libs from system and preinstall them instead of building from source
• Windows: MINGW64 won't launch Tauon from our build scripts due to pythonw link missing for specific python versions, i.e. pythonw3.12.exe msys2/MINGW-packages#22856
• Windows: colored_traceback is disabled due to Windows pyinstaller EXE - _curses.error: lost sys.stdout staticshock/colored-traceback.py#25

---

Release blockers:

• librespot is commented out - requirements.txt: Set versions as minimum instead of hardcoding as exact  kokarare1212/librespot-python#286
• Windows: librespot.exe is untested
• Check that Tekore is being picked up (needs someone with Spotify Premium)
• Windows: fonts are untested