Add Flatpak packaging

This commit adds initial packaging to build and distribute Purr Data
using Flatpak.
8 jobs for sam/flatpak in 0 seconds (queued for 746 minutes)
latest
Status Job ID Name Coverage
  Test
failed #13394
x86_64 stretch debian
debian_stretch_x86_64_deb

failed #13398
dmg v10.11 osx
osx_10.11_x86_64_dmg

failed #13399
dmg v10.8 osx
osx_10.8_x86_64_dmg

failed #13401
stretch arm raspbian
raspbian_stretch_armv7l_deb

failed #13395
i386 v14.04 ubuntu
ubuntu_14.04_i386_deb

failed #13396
x86_64 v14.04 ubuntu
ubuntu_14.04_x86_64_deb

failed #13397
x86_64 v16.04 ubuntu
ubuntu_16.04_x86_64_deb

failed #13400
i386 windows
windows_i386_innosetup

 
Name Stage Failure
failed
debian_stretch_x86_64_deb Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
ubuntu_14.04_i386_deb Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
ubuntu_14.04_x86_64_deb Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
ubuntu_16.04_x86_64_deb Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
osx_10.11_x86_64_dmg Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
osx_10.8_x86_64_dmg Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
windows_i386_innosetup Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
raspbian_stretch_armv7l_deb Test There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log