Fix linuxdeploy configuration for plugin dependencies

Author: aedrax

.github/workflows/release.yml

@@ -80,8 +80,15 @@ jobs:
           wget -q https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage
           chmod +x linuxdeploy*.AppImage
           export APPIMAGE_EXTRACT_AND_RUN=1
+          # --deploy-deps-only makes linuxdeploy walk the staged plugin .so
+          # files: their dependencies (e.g. libQt6WebEngineCore for mapviewer)
+          # get bundled into usr/lib and the plugins' rpaths get rewritten,
+          # without moving the plugins out of usr/plugins. Seeing WebEngine in
+          # the AppDir then triggers the qt plugin's WebEngine handling
+          # (QtWebEngineProcess, resources, locales).
           ./linuxdeploy-x86_64.AppImage --appdir AppDir \
             --executable build/app/logdor \
+            --deploy-deps-only AppDir/usr/plugins \
             --desktop-file assets/linux/logdor.desktop \
             --icon-file app/resources/icons/logdor.png \
             --plugin qt \