Setup Travis CI for build AppImage (portable binary package for Linux)

[ghost]

Lets setup Travis CI for auto-build AppImage (portable package for Linux) for each commit:

0. Create ../blob/master/.travis.yml
1. https://github.com/appimage/AppImageKit
   1.1. https://github.com/probonopd/linuxdeployqt
   1.2 https://github.com/linuxdeploy
2. https://github.com/probonopd/uploadtool
3. Enable Travis CI pushing to GitHub releases for this repo.

For example, take a look on LeoCAD .travis.yml implementation:

• https://github.com/leozide/leocad/blob/master/.travis.yml

And here is how resulted builds would look like:

• https://github.com/leozide/leocad/releases/tag/continuous

For any AppImage packaging questions & support:

• https://docs.appimage.org/user-guide/faq.html#question-where-do-i-get-support

[herace]

@Symbian9 Added 👍

• curtsy of @azagaya

#15

[azagaya]

Hi @herace ! Sorry for the delayed response. I wouldn't close this yet, because you still have to enable Travis and give it permissions to push to releases.