Fix #220 appimage build script

[JocelynDelalande]

Fix #220

That is a first step, that allow building AppImages locally.

If that looks good, I'd suggest that we build and upload (maybe using GH workflows ?) AppImage automatically

• an appimage on every push to develop (continuous build)
• an appimage on every PR (to allow power-users to beta-test stuff)

… And we should definitely start building AppImages for releases, but maybe manually, to allow further control and testing… and cryptographic signature (GPG).

[JocelynDelalande]

This is a draft as it needs further testing on different distros on my side. But you can help me testing and toy around with that first AppImage I made with this PR (two files are the same, one of those being GPG-signed, the other not).

https://nuage.delalande.fr/s/TdDsYfsTMBxT9QC

It won't overwrite your existing LIbreOsteo installation and data. It will use a new data (database and upload directory) within ~/.local/share/libreosteo

to start playing :

⚠️ For now : use it for testing, not for managing actual data ! ⚠️

• download the file
• (verify and extract it if you choosen the .gpg file)
• make the .AppImage executable
• run it !

[JocelynDelalande]

@jbgury would it be possible to make the PR tested against travis, as I am trying stuff on travis ? (or maybe allow me to push to unprotected branches on libreosteo/Libreosteo repo ?)

[JocelynDelalande]

@jbgury j'ai l'erreur suivante pour les tests fonctionnels :

Tests.Core.001 Register User                                                  

==============================================================================

First Installation :: Register an administrator on freshed install... | FAIL |

WebDriverException: Message: Reached error page: about:neterror?e=connectionFailure&u=http%3A//localhost%3A8085/&c=UTF-8&d=Firefox%20ne%20peut%20%C3%A9tablir%20de%20connexion%20avec%20le%20serveur%20%C3%A0%20l%E2%80%99adresse%20localhost%3A8085.

Je ne vois pas trop ce que j'ai changé qui puisse casser ça. Une idée ?
source : https://travis-ci.com/github/libreosteo/Libreosteo/jobs/386400617

[jbgury]

Tu n'as plus le problème visiblement

[JocelynDelalande]

Oui, je ne sais pas trop si ça tient à quelque-chose que tu aurais fait ou au fait que moi j'ai configuré la CI sur mon fork. En tout cas c'est OK pour tester.