build appimage with static runtime

This allows the user to run the appimage on non fuse2 systems (all
moderns systems use fuse3). This is achieved by using the static
appimage runtime. Since linuxdeploy doesn't support changing the runtime
I only use it to create the appdir directory. Then I use the original
appimagetool to package the appimage using the static runtime.

This should also make it possible to run the appimage on a non glibc
system but I don't have access to one so I can't test it.

fixes: #485

scripts/appimage/Dockerfile

@@ -43,7 +43,7 @@ RUN sed -i 's#enabled=1#enabled=0#' /etc/yum/pluginconf.d/fastestmirror.conf &&
         # kgraphviewer
         boost boost-devel graphviz-devel \
         # appimages
-        fuse fuse-libs bzip2 && \
+        fuse fuse-libs bzip2 desktop-file-utils && \
     ln -s /usr/bin/cmake3 /usr/bin/cmake && \
     rm -Rf /var/cache/yum && \
     . /opt/rh/devtoolset-11/enable
@@ -66,7 +66,12 @@ RUN wget https://download.qt.io/official_releases/qt/5.15/${QT_VERSION}/single/q
 
 # appimage build tools
 RUN wget https://github.com/linuxdeploy/linuxdeploy/releases/download/1-alpha-20230713-1/linuxdeploy-x86_64.AppImage &&     chmod +x linuxdeploy-x86_64.AppImage && \
-    wget https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage && chmod +x linuxdeploy-plugin-qt-x86_64.AppImage && mv linuxdeploy* /usr/bin/
+    wget https://github.com/linuxdeploy/linuxdeploy-plugin-qt/releases/download/continuous/linuxdeploy-plugin-qt-x86_64.AppImage && chmod +x linuxdeploy-plugin-qt-x86_64.AppImage && mv linuxdeploy* /usr/bin/ && \
+    wget https://github.com/AppImage/type2-runtime/releases/download/continuous/runtime-x86_64 && \
+    wget https://github.com/AppImage/appimagetool/releases/download/continuous/appimagetool-x86_64.AppImage && \
+    chmod +x appimagetool-x86_64.AppImage && mv appimagetool-x86_64.AppImage /usr/bin/ && \
+    mv runtime-x86_64 /opt/
+
 
 # qcustomplot
 RUN cd /opt && mkdir qcustomplot && cd qcustomplot && \

scripts/appimage/build_appimage.sh

@@ -74,4 +74,7 @@ linuxdeploy-x86_64.AppImage --appdir appdir --plugin qt \
     -d "./appdir/usr/share/applications/com.kdab.hotspot.desktop" \
     --output appimage
 
-mv Hotspot*x86_64.AppImage "/output/hotspot-$gitversion-x86_64.AppImage"
+# package appdir with type 2 runtime so we don't depend on glibc and fuse2
+appimagetool-x86_64.AppImage --runtime-file /opt/runtime-x86_64 appdir
+
+mv Hotspot-x86_64.AppImage "/output/hotspot-$gitversion-x86_64.AppImage"