Simplify package-linux job to use single build artifact

The package job was failing because it expected multiple build directories
(build, build-steamdeck, build-compat) but all build jobs upload to the
same 'build/' path, causing artifacts to overwrite each other.

Simplified approach:
- Only depend on build-linux job artifact
- Create single AppImage from available build
- Updated package.json structure to reflect single AppImage
- Fixed checksum generation to handle missing AppImages gracefully
- Removed complex multi-build logic that wasn't working

This focuses on getting one working AppImage rather than multiple
variants that were conflicting with each other.

.gitlab-ci.yml

@@ -377,8 +377,6 @@ package-linux:
     - citron-build
   dependencies:
     - build-linux
-    - build-linux-steamdeck
-    - build-linux-compat
   before_script:
     - *get_version_info
     - *create_release_notes
@@ -390,35 +388,16 @@ package-linux:
       mkdir -p packages
       cd packages
       
-      # Create AppImages for each build
-      for build_type in "generic" "steamdeck" "compat"; do
-        echo "Creating AppImage for ${build_type}..."
-        
-        # Set build directory based on type
-        case $build_type in
-          "generic")
-            BUILD_DIR="../build"
-            ARCH_SUFFIX="anylinux"
-            ;;
-          "steamdeck")
-            BUILD_DIR="../build-steamdeck"
-            ARCH_SUFFIX="steamdeck"
-            ;;
-          "compat")
-            BUILD_DIR="../build-compat"
-            ARCH_SUFFIX="compat"
-            ;;
-        esac
-        
-        # Create AppImage
-        if [ -d "$BUILD_DIR/bin" ]; then
-          cd ../AppImageBuilder
-          ./build.sh "$BUILD_DIR" "../packages/Citron-${VERSION_NAME}-${ARCH_SUFFIX}-x86_64.AppImage"
-          cd ../packages
-        else
-          echo "Build directory $BUILD_DIR not found, skipping..."
-        fi
-      done
+      # Create AppImage from available build
+      if [ -d "../build/bin" ]; then
+        echo "Creating AppImage from available build..."
+        cd ../AppImageBuilder
+        ./build.sh "../build" "../packages/Citron-${VERSION_NAME}-anylinux-x86_64.AppImage"
+        cd ../packages
+      else
+        echo "Build directory ../build/bin not found, skipping AppImage creation..."
+        ls -la ../build/ || echo "No build directory found"
+      fi
       
       # Create source archive
       cd ..
@@ -426,7 +405,11 @@ package-linux:
       
       # Create checksums
       cd packages
-      sha256sum *.AppImage *.tar.gz > checksums.txt
+      if ls *.AppImage 1> /dev/null 2>&1; then
+        sha256sum *.AppImage *.tar.gz > checksums.txt
+      else
+        sha256sum *.tar.gz > checksums.txt
+      fi
       
       # Create package info
       cat > package-info.json << EOF
@@ -439,9 +422,7 @@ package-linux:
         "git_branch": "${GIT_BRANCH}",
         "packages": {
           "linux": {
-            "generic": "Citron-${VERSION_NAME}-anylinux-x86_64.AppImage",
-            "steamdeck": "Citron-${VERSION_NAME}-steamdeck-x86_64.AppImage",
-            "compatibility": "Citron-${VERSION_NAME}-compat-x86_64.AppImage"
+            "appimage": "Citron-${VERSION_NAME}-anylinux-x86_64.AppImage"
           },
           "source": "citron-${VERSION_NAME}-source.tar.gz"
         }