Generate AppImage release

[baimafeima]

Generate a first AppImage release to see whether Zhuli is still functional for users.

• Read https://docs.appimage.org/introduction/index.html
• Read https://github.com/AppImage/AppImageKit/wiki/Bundling-Java-apps
• Bake AppImage
• Test AppImage
• Release AppImage

[probonopd]

Hi @baimafeima, welcome to AppImage. Kindly let me know if you are stuck and need some help.