Add appimage-builder recipe

1 job from master in 1 minute and 12 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #5857
build-amd64

00:01:12

 
Name Stage Failure
failed
build-amd64 Test
    bundler.run()
File "/usr/local/lib/python3.6/dist-packages/AppImageBuilder/app_dir/bundlers/apt/bundler.py", line 60, in run
exclusion_list = self._generate_exclusion_list()
File "/usr/local/lib/python3.6/dist-packages/AppImageBuilder/app_dir/bundlers/apt/bundler.py", line 107, in _generate_exclusion_list
complete_install_list = self.apt_get.generate_install_list(self.config.apt_include)
File "/usr/local/lib/python3.6/dist-packages/AppImageBuilder/commands/apt_get.py", line 52, in generate_install_list
raise AptGetError('Unable to download packages')
AppImageBuilder.commands.apt_get.AptGetError: Unable to download packages
ERROR: Job failed: exit code 1