feat: implement AppImage auto-updater for Linux

Author: derspotter

VERSION.cmake

@@ -5,9 +5,9 @@
 # ------------------------------------
 # Version information
 # ------------------------------------
-set(MIRALL_VERSION_MAJOR 4)
-set(MIRALL_VERSION_MINOR 0)
-set(MIRALL_VERSION_PATCH 50)
+set(MIRALL_VERSION_MAJOR 3)
+set(MIRALL_VERSION_MINOR 14)
+set(MIRALL_VERSION_PATCH 0)
 set(MIRALL_VERSION_YEAR  2025)
 set(MIRALL_SOVERSION     0)
 set(MIRALL_PREVERSION_HUMAN "4.1.0 alpha")  # For preversions where PATCH>=50. Use version + alpha, rc1, rc2, etc.

admin/linux/build-appimage.sh

@@ -28,9 +28,11 @@ if [ -e "/opt/rh/gcc-toolset-11/enable" ]; then
     source /opt/rh/gcc-toolset-11/enable
 fi
 
+rm -rf /app
 mkdir /app
 
 # Build client
+rm -rf build-client
 mkdir build-client
 cd build-client
 cmake \

src/gui/CMakeLists.txt

@@ -285,6 +285,13 @@ IF(BUILD_UPDATER)
         updater/updater.h
         updater/updater.cpp
     )
+    # Linux AppImage updater
+    if(UNIX AND NOT APPLE)
+        list(APPEND updater_SRCS
+            updater/appimageupdater.h
+            updater/appimageupdater.cpp
+        )
+    endif()
 endif()
 
 IF( APPLE )