Adds AppImage requirements

pyproject.toml

@@ -27,8 +27,14 @@ requires = [
 requires = []
 
 [tool.briefcase.app.tugpgp.linux.appimage]
-system_requires = []
+system_requires = ["gstreamer1.0-gl", "libasound2", "libegl1", "libfontconfig1", "libgl1", "libnss3", "libpulse0", "libwayland-cursor++0", "libxcb-icccm4", "libxcb-image0", "libxcb-keysyms1", "libxcb-randr0", "libxcb-render-util0", "libxcb-shape0", "libxcomposite1", "libxdamage1", "libxi6",  "libxkbfile1", "libxrandr2", "libxtst6", "libegl-mesa0", "curl"]
+dockerfile_extra_content = """
+ENV APP_PACKAGES_PATH="/app/appimage/{{ cookiecutter.formal_name }}/{{ cookiecutter.formal_name }}.AppDir/usr/app_packages"
+ENV LD_LIBRARY_PATH="$APP_PACKAGES_PATH/shiboken6:$APP_PACKAGES_PATH/PySide6:$APP_PACKAGES_PATH/PySide6/Qt/lib"
+"""
 linuxdeploy_plugins = []
+support_package="Python-3.10-linux-x86_64-support.custom.tar.gz"
+
 
 [tool.briefcase.app.tugpgp.linux.flatpak]
 flatpak_runtime = 'org.kde.Platform'