Add gitlab-ci

1 job for foo in 1 minute and 57 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Package
failed #358817
flatpak
flatpak:master

00:01:57

 
Name Stage Failure
failed
flatpak:master Package
Running after_script
Uploading artifacts for failed job
Uploading artifacts...
WARNING: µPlayer.flatpak: no matching files
WARNING: repo.tar: no matching files
WARNING: .flatpak-builder/build/µPlayer/_flatpak_build/meson-logs/meson-log.txt: no matching files
WARNING: .flatpak-builder/build/µPlayer/_flatpak_build/meson-logs/testlog.txt: no matching files
ERROR: No files to upload
ERROR: Job failed: exit code 1