Right now when path to AppImage has spaces in it (for example if it gets installed in ~/Applications by a manager I'll be named "Isle Portable") I'll fail to execute with an error:
```
/tmp/.mount_Isle PCAHbep/AppRun: line 16: [: /home/damglador/Applications/Isle: binary operator expected
/tmp/.mount_Isle PCAHbep/AppRun: line 24: /tmp/.mount_Isle PCAHbep/usr/bin/isle-config: Input/output error
```
This patch should fix it.
* AppImage packaging
* Add flags to specify location of required local files
`--build=path` specifies where on the system is the directory with pre-build game binaries (must have binaries `isle` and `isle-config` in `path/bin` and game-specific libraries in `path/lib`)
`--apprun=path` specifies where the apprun is
`--desktop-file=path` same for the desktop file
* Move to packaging/linux
* Move building to appimage/build and ignore it in git
* Use local icon. Option to specify location for it
* Cleaning
* Attempt at Github automation
* Update CMakeLists.txt
* Fix build
* I guess it doesn't need quotes
* Update CMakeLists.txt
* Update release.yml
* Work around for liblego1.so loading, fix arguments
* Create testing.yml
* Update testing.yml
* I should pay more attention to what docs say
* Fix copy-pasting mistake
* Add AppImage packaging to the Release workflow
* Try fixing filepicker
* Delete testing.yml
* Fix releases
Can't specify where linuxdeploy leaves the file without specifying the name of the file, which I don't want to do, so just move the file in `dist` after packaging.
* Remove unnecessary changes
* Add qt6-xdgdesktopportal-platformtheme as deps
Needed to call the xdg filepicker, basically desktop-specific filepicker. Hopefully this will allow to use it in AppImage
* Get back flatpak in release
* Update release.yml
* Remove libglew-dev from apt install
* Fix duplicate upload artifact
* Update release.yml
Co-authored-by: Christian Semmler <mail@csemmler.com>
* Remove *.AppImage pattern in Download All Artifacts
---------
Co-authored-by: Christian Semmler <mail@csemmler.com>
