[CI Ubuntu] Build AppImage

Upload an AppImage artifact on CI builds. This AppImage is a
simplified version of the official one. It is meant to help
with debugging PRs that fix issues.

.github/workflows/ci_ubuntu.yaml

@@ -107,8 +107,35 @@ jobs:
           mkdir upload/cmake/libtorrent
           cp libtorrent/build/compile_commands.json upload/cmake/libtorrent
 
+      - name: 'AppImage: Prepare env'
+        run: |
+          sudo apt install libfuse2
+          wget https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
+          wget https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage
+          wget https://github.com/linuxdeploy/linuxdeploy-plugin-appimage/releases/download/continuous/linuxdeploy-plugin-appimage-x86_64.AppImage
+          chmod +x linuxdeploy-x86_64.AppImage
+          chmod +x linuxdeploy-plugin-qt-x86_64.AppImage
+          chmod +x linuxdeploy-plugin-appimage-x86_64.AppImage
+
+      - name: 'AppImage: Prepare nox'
+        if: matrix.qbt_gui == 'GUI=OFF'
+        run: |
+          mkdir -p qbittorrent/usr/share/icons/hicolor/scalable/apps/
+          mkdir -p qbittorrent/usr/share/applications/
+          cp dist/unix/menuicons/scalable/apps/qbittorrent.svg qbittorrent/usr/share/icons/hicolor/scalable/apps/qbittorrent.svg
+          cp .github/workflows/helper/appimage/org.qbittorrent.qBittorrent.desktop qbittorrent/usr/share/applications/org.qbittorrent.qBittorrent.desktop
+
+      - name: 'AppImage: Package'
+        run: |
+          ./linuxdeploy-x86_64.AppImage --appdir=qbittorrent --plugin qt
+          rm qbittorrent/apprun-hooks/*
+          cp .github/workflows/helper/appimage/export_vars.sh qbittorrent/apprun-hooks/export_vars.sh
+          NO_APPSTREAM=1 \
+          OUTPUT=upload/qbittorrent-CI_Ubuntu_x86_64.AppImage \
+          ./linuxdeploy-x86_64.AppImage --appdir=qbittorrent --output appimage
+
       - name: Upload build artifacts
         uses: actions/upload-artifact@v3
         with:
-          name: build-info_ubuntu-x64_${{ matrix.qbt_gui }}_libtorrent-${{ matrix.libt_version }}_Qt-${{ matrix.qt_version }}
+          name: qBittorrent-CI_Ubuntu-x64_${{ matrix.qbt_gui }}_libtorrent-${{ matrix.libt_version }}_Qt-${{ matrix.qt_version }}
           path: upload

.github/workflows/helper/appimage/export_vars.sh

@@ -0,0 +1,11 @@
+# this file is called from AppRun so 'root_dir' will point to where AppRun is
+root_dir="$(readlink -f "$(dirname "$0")")"
+
+# Insert the default values because after the test we prepend our path
+# and it will create problems with DEs (eg KDE) that don't set the variable
+# and rely on the default paths
+if [[ -z ${XDG_DATA_DIRS} ]]; then
+    XDG_DATA_DIRS="/usr/local/share/:/usr/share/"
+fi
+
+export XDG_DATA_DIRS="${root_dir}/usr/share:${XDG_DATA_DIRS}"

.github/workflows/helper/appimage/org.qbittorrent.qBittorrent.desktop

@@ -0,0 +1,6 @@
+[Desktop Entry]
+Name=qBittorrent
+Exec=qbittorrent-nox %U
+Icon=qbittorrent
+Type=Application
+Categories=Network