CI for game add-ons

[garbear]

To keep track of CI PRs for game add-ons:

• https://github.com/kodi-game/game.libretro.hatari/pull/2, https://github.com/kodi-game/game.libretro.hatari/pull/3
• https://github.com/kodi-game/game.libretro.snes9x/pull/11
• https://github.com/kodi-game/game.libretro/pull/20
• https://github.com/kodi-game/game.libretro.beetle-bsnes/pull/4
• https://github.com/kodi-game/game.libretro.2048/pull/4
• https://github.com/kodi-game/game.libretro.4do/pull/1
• https://github.com/kodi-game/game.libretro.dosbox/pull/4
• https://github.com/kodi-game/game.libretro.scummvm/pull/12
• https://github.com/kodi-game/game.libretro.genplus/pull/2